Lydia first appears in March 2009 as a friend of
Josh Ashworth (
Sonny Flood). She orders
Steph Cunningham (
Carley Stenson) to fire Sarah after her sister Persephone Hart tells her that Sarah hit her.
Theresa McQueen (
Jorgie Porter) steals Lydia's handbag and she accuses Josh's girlfriend
Amy Barnes (
Ashley Slanina-Davies). She decides not to press charges against Theresa. Amy accuses Lydia and Josh of having an affair. Josh tells her she is a lesbian and Amy hits her. Amy later apologises, however is still jealous of Lydia and Josh's relationship. At Josh's birthday party,
Michaela McQueen (
Hollie-Jay Bowes) assumes that Lydia and Sarah are a couple. Sarah and Lydia then become friends. In late March, after agreeing to dance with Sarah during one of the classes, Lydia kisses her. Sarah denies it when Lydia claims that they felt something. Sarah then shows more of an interest in Lydia. Lydia finds out Sarah is bribing
Holly Cunningham (Lydia Waters) to befriend Persephone so she could get closer to her, leaving things awkward between the girls. The next day, Lydia allays her fears to Sarah over relationships and the girls seal it with a kiss, which Michaela sees. Sarah and Lydia then begin a full relationship. It is revealed that out of her family, Persephone is the only one who knows of Lydia's sexuality. Lydia replaces
Rhys Ashworth (
Andrew Moss) as the drummer of Josh's band 'The Somethings' as he kicked him out because he was against having wheelchair user
Hayley Ramsey (Kelly Marie Stewart) as the lead singer because of their bad breakup. Lydia is later kicked out of the band due to unreliability. After breaking up with Sarah, Lydia becomes jealous of Zoe and Sarah's friendship. Lydia then begins going out with Sarah again although she is more invested in the relationship with Sarah. Lydia's true colours start to show when she tells Sarah she has received dead flowers on her and former girlfriend Charlotte's anniversary, she tells Sarah she thinks they are from Charlotte, she then shows the same bouquet to Charlotte and accuses Zoe. It is then revealed during an argument with Charlotte that Lydia tried to kill herself when she and Charlotte split up. Lydia sees Sarah and Zoe going on an adventure holiday with
Steph Cunningham (
Carley Stenson),
Fernando Fernandez (Jeronimo Best) and
Gilly Roach (
Anthony Quinlan) and is jealous when she takes Zoe. Lydia follows them and has an argument with Sarah. She continues to pretend Charlotte is stalking her in order to gain sympathy. When left alone with Zoe, she tells her Sarah tried to kill herself over her. Later, Lydia overhears Sarah admit her love to a drunken Zoe. The next day, Lydia begins slitting her wrists and tries to convince Sarah that Zoe is trying to split them up. Lydia uses a knife on one of the parachutes which Zoe will use, however they get mixed up. As the girls head into the sky, Lydia begins to feel guilty and tries to stop them, however Zoe and Sarah jump out. Lydia follows and is horrified when Zoe's parachute deploys and Sarah's does not. Sarah then hits the ground. Lydia and Zoe rush to her body, both crying. Lydia frames Zoe for the death of Sarah by hiding the knife used to sabotage the parachute behind Zoe's bed. Lydia then proceeds to slit her wrists in the shower due to her guilt. As Lydia recovers in hospital, Zoe is charged with Sarah's murder. Realising she has escaped arrest for accidentally killing Sarah, Lydia lies to Charlotte, telling her how she and Sarah planned to travel and even adopt.
Archie Carpenter (Stephen Beard) confronts Lydia over the day of Sarah's death and is shocked when Lydia claims she was not supposed to die. Archie goes to the police, however they do not do anything. During Sarah's funeral, Archie arrives at her wake and announces Lydia caused her death. When no one believes him, he is removed. Before Zoe's court case, Mike goes to visit her. Lydia tries to tell Mike that she will try to appear innocent. When he returns, and claims he knows she could not have killed Sarah, Lydia manipulates him into believing that she was just trying to get him on side. At this time, Charlotte and Lydia get back together. At the court case, Lydia lies whilst giving a statement. Charlotte accompanies Lydia to the case, agreeing to keep their new relationship quiet. However, when she sees the knife used to cut the parachute, Charlotte realises Lydia was responsible for Sarah's death. After she confesses, Lydia tells Charlotte if she goes to prison, she will kill herself. Zoe is found not guilty of Sarah's murder, due to the court believing Sarah committed suicide. After Lydia catches Mike kissing Zoe, she goes to Amy and tells her what she saw, and tells her she believes Zoe is trying to get Mike on her side to make it look like she is innocent. Lydia expresses her doubts with Mike, still trying to blame Zoe for Sarah's death. However, after realising she could try to get Zoe on her side, she pleads with her to forgive her and move into the Barnes family home. An angry Zoe throws her out. Zoe then approaches Lydia and apologises. The pair slowly become friends. However, Zoe is only pretending in order to get a confession. Lydia and Zoe kiss as part of Zoe's plan to expose Lydia as Sarah's killer. Mike throws Zoe out of the flat. On New Year's Eve, Lydia discovers Zoe's true reasons for befriending her and decides to murder her at Sarah's grave, before taking her own life. Zoe and Lydia meet in a church to admit their 'relationship' to Sarah. However, Zoe flees and is knocked unconscious. When she wakes up, she finally gets a confession from Lydia, who admits why she cut the parachute. Zoe attacks Lydia before leaving. At Sarah's grave, Lydia stabs Zoe, as Charlotte, Mike, and Dave arrive to stop her. As Zoe is taken away in an ambulance, Lydia is arrested. Lydia is questioned by
D.I. Fletcher (Laura Fletcher) as Zoe recovers in hospital. Lydia admits everything and she is then charged for the murder of Sarah and attempted murder of Zoe. She is later given a lifetime prison sentence. ==Reception==