Abi moves to
Albert Square with her parents
Max (
Jake Wood) and
Tanya Branning (
Jo Joyner), and sister
Lauren Branning (
Madeline Duggan), where she befriends
Ben Mitchell (Charlie Jones). Soon after, when Max's affair with his son
Bradley Branning's (
Charlie Clements) wife,
Stacey Slater (
Lacey Turner), is revealed, Max and Tanya separate and eventually divorce. Abi begins to live sporadically with each parent, frequently defending Max to Tanya and Lauren, until Max and Tanya reunite, however Abi leaves with Tanya after learning of Max's financial problems. Abi starts to take an interest in Max's lodger
Darren Miller (
Charlie G. Hawkins), who is left uncomfortable when she tries to kiss him, telling her she is too young. She later develops a crush on
Jay Brown (
Jamie Borthwick), and the two begin dating. Jay and Abi cuddle up as they are watching television, but Max believes they are about to have sex, so he throws Jay out and rips Abi's bridesmaid dress to Greg and Tanya's wedding. They go to buy a new one, but they have a car crash on Greg and Tanya's wedding day. They suffer minor injuries and both recover. Despite Abi's insecurities over Jay's friendship with
Lola Pearce (
Danielle Harold), she and Jay remain together, and eventually Max comes to accept them as a couple. Jay proposes to Abi and she accepts, but she is faced with a dilemma when she is offered the chance to go to
Costa Rica to help with
sea turtle conservation. Jay gives Abi an ultimatum, threatening to break up with her if she goes to Costa Rica, but she goes regardless. She returns weeks later and the pair reconcile. Abi meets her cousin
Dexter Hartman (Khali Best), not knowing they are related, and this causes Jay to be jealous until the truth of their relationship is revealed. Abi tries to support Lauren (now played by
Jacqueline Jossa) with her drinking problem, however, this ends badly when Lauren destroys Abi's revision notes. Max is framed for causing a car crash that leaves
Phil Mitchell (
Steve McFadden) hospitalised. Abi and Lauren struggle to pay Max's legal costs, as well as their bills. Abi receives her exam results and discovers she has not gained the grades to go to university to become a vet, but Lauren, believing that Abi has passed the exams, throws a party, during which Abi blurts out that she blames Lauren for her poor results because she has an alcohol problem. Abi decides to continue studying, but when Max goes to prison, she has to take a job and struggles to find time for her studies. Max is proven innocent and returns home to support his family. In an argument between Jay and Dexter, Abi discovers that on a holiday, Jay kissed a barmaid. She also finds out that Lola knew and furiously confronts her. However, after a heart-to-heart with Jay, they decide to work through their issues and she fixes things with Dexter and Lola as well. She also takes in a stray dog,
Tramp. Abi's final A-Level results come through and she tells everyone that she has got what she needed to get into the
University of Liverpool. However, she later confides in Jay that she has been lying, as not to disappoint her family. He encourages her to go through clearing and she gets a position doing a similar course at the
University of Bolton. Jay decides to go with Abi. Ben returns from prison and reveals he thinks Jay is in love with Lola, and he confesses this to Abi when she confronts him. He then ends things to stay in Walford. Devastated, she wants to leave for Bolton immediately, but when Max refuses to take her, she drives the car herself, accidentally running over Tramp, killing him; she callously declares that "things die". After her break up with Jay, Abi becomes a much nastier and bitter person. She begins a relationship with Ben (now played by
Harry Reid), which is discovered by
Emma Summerhayes (
Anna Acton) who informs Max of the relationship. Max demands that Abi does not see Ben any more, which Abi refuses to do. After she moves in with him, Ben reveals to her that he might still be gay and is worried he will never get over his homosexuality, but Abi assures him that they will make things work. Following Ben's arrest for
Lucy Beale's (
Hetti Bywater) murder, Abi tells Phil that Max assaulted Lucy to get Ben off. Despite being innocent, Max turns himself in and is formally charged while Ben is released. Stacey visits Max, who tells her that he thinks Abi killed Lucy. Stacey confronts Abi, who attacks Stacey, blaming her for her parents' split and Bradley's death. Ben and Abi continue their relationship, but Ben is secretly seeing
Paul Coker (
Jonny Labey).
Babe Smith (
Annette Badland) offers Abi work in the pub kitchen, and Abi tells Babe that she is able to turn a blind eye to Ben's homosexuality, as long as he loves her. However, when Abi finds a present that Ben has got for Paul, she realises he has feelings for Paul and confides in Babe, who helps her to publicly announce that she is pregnant. Ben asks Abi to have a termination but then changes his mind, saying he wants the baby. Abi then goes to Babe, panicking because she has lied and is not really pregnant. She decides to tell Ben the truth, but as she is about to do so, he tells her he has caught chlamydia. Abi later tests positive for chlamydia. Babe pushes Abi into Ben as he is pushed by Phil, knocking her to the ground. Babe takes Abi away from the square, and on their return, Abi tells Ben she has had a miscarriage. When she later sees Ben being comforted by Paul, she feels uneasy. Abi and Babe discover that Ben's half-sister
Louise Mitchell (
Tilly Keeper) has been using Phil's credit card, so they force her to return everything she has bought. After a spat with Abi, Babe sends Ben a letter, telling him of the fake pregnancy. Louise finds the letter and blackmails Abi, telling her to move away with Ben. Abi tries to persuade Ben into moving but he refuses, saying he needs to be there for alcoholic Phil. Abi accidentally confesses, after which Ben gets drunk and kisses Abi in the pub toilets and starts to undress her, but then drags her into the pub in her underwear and reveals via the karaoke microphone that she made up her pregnancy. Babe emotionally blackmails Abi, forcing her to resign. Abi exposes Babe's secrets to the pub's landlord,
Mick Carter (
Danny Dyer), so he tells Abi that she can keep her job. Abi locks Babe in the kitchen freezer room as an act of revenge, although Babe frames her sister,
Sylvie Carter (
Linda Marlowe). Abi is then reinstated at the Vic by a seemingly apologetic Babe but her behaviour, when alone in the kitchen with Abi, is threatening. Babe later leaves Walford after being thrown out by her family, so Abi runs the kitchen alone. Abi tells Lauren's boyfriend,
Steven Beale (
Aaron Sidwell), that they would make a good couple during a heart-to-heart. Abi and Steven fall out with Lauren at Abi's 21st birthday party and start an affair; Abi later learns that Steven is lying about having a brain tumour so that Lauren will not leave him. Despite being against the idea, Abi does not tell Lauren as Steven promises Abi he is planning to leave Lauren to be with her. Then Abi is stunned by Steven's public marriage proposal to Lauren. Jane overhears Abi and Steven talking about their relationship and confronts them. Abi then discovers she is pregnant by Steven. Abi helps Steven keep up the lie by giving him a brain scan from a dog and animal medication that will give him symptoms of an illness, as well as helping to keep Lauren away from doctor's appointments that Steven has invented. Abi discovers that Ian's restaurant is on fire and goes inside. She finds Jane on the floor struggling to breathe. A pipe falls onto Abi, knocking her unconscious, but Max and Steven soon find her and drag her out. She is taken to hospital with Lauren by her side in the ambulance. At the hospital, Abi tells Steven he is going to be a father. Steven declares his love for her and makes a promise that he will make their relationship work. Steven then dies from injuries inflicted by Max during the fire, leaving an unaware Abi devastated. Out of jealousy that Lauren is getting all the attention, Abi tries to tell Lauren about her pregnancy, but Lauren angrily mistakes this as gloating about her own abortion. Upset at the accusation, Abi says that she wishes Lauren died instead and that she never deserved Steven. Steven's tumour lie is revealed, so Abi attends Steven's funeral as the sole mourner and declares her love. Abi is fired from her job at the vets when they have CCTV evidence of her stealing medication. She asks Mick to extend her working hours at the pub, but he makes her redundant as they need to save money. Lauren eventually learns the truth about Abi and Steven's affair when she catches Abi wearing her wedding dress. Lauren is disgusted to learn that Abi is pregnant with Steven's baby, but over time, Lauren becomes more supportive. Abi goes away, and on her return, is confused when people are showing hatred towards Max, unaware that he was involved in a plan to redevelop Albert Square, including turning business into luxury flats and evicting people from their homes and places of work. Max reveals that he has been planning this as part of revenge against the community of Walford for being falsely imprisoned for Lucy’s murder and also turns on Abi by reminding her that she implicated him to the police for Lucy‘s murder. However, they later make amends. On Christmas Day, Tanya returns to take Lauren and Abi away from Walford, revealing that Max killed Steven and tried to kill Jane. Lauren and Abi reject Max. Max goes to the roof of the
Queen Vic, planning to jump, so Lauren and Abi climb on to the ledge to try and stop him. As Max agrees to his daughter's pleas to not jump, Lauren slips on the wet surface and Abi grabs her hand to stop her falling; both sisters fall off to the ground. Still alive, they are taken to hospital, where an ultrasound shows Abi's baby is alive. Abi has a CT scan and Lauren has surgery. Lauren recovers but
Dr. Harding (Nick Waring) tells Max that Abi is brainstem dead and has no chance of regaining consciousness. Abi's baby is delivered via
cesarean section. Max is hopeful that Abi will recover and does not tell Lauren the truth, but she slaps Max when she finds out. Max obtains a court order to stop Abi's life support being withdrawn and plans to take her to the US for a treatment that will cost £2,000,000, but Harding urges Max to do the dignified thing for Abi as she is already dead and as Abi is not a minor, he has no legal right to take her. The family finally make the decision to switch off Abi's life support, and she dies with her parents and sister at her bedside. After her funeral, Max names her baby
Abi Branning, in her memory and she is toasted in the Vic while her friends let off balloons. ==Reception==