2014–2019 Hall turned professional in July 2014, Hall won her first professional title in September at the Open Generali de Strasbourg on the
LET Access Series, which she won by four strokes. She hit a hole-in-one at the
Dubai Ladies Masters in December, with her feat earning her a £50,000
Mercedes. The following week, Hall entered the Laila Aicha Tour School in
Morocco to try and earn a tour card for the
Ladies European Tour. She finished second in the event and thus won her tour card for the following year. In 2015, Hall recorded six top-20 finishes on the Ladies European Tour and made 11 out of 12 cuts. At the tournament, Hall missed the cut by ten strokes at
Lancaster Country Club,
Pennsylvania, after shooting 14-over-par. In December, she ended her season with a tied-12th finish at the Dubai Ladies Masters. In February 2016, Hall won the
Oates Victorian Open on the
ALPG Tour at
Barwon Heads, Victoria. She missed the cut in the
2016 Women's British Open at
Woburn, but finished runner-up at the
Fatima Bint Mubarak Ladies Open in November to
Beth Allen. Hall shot an eight-under-par 64 during her second round there to equal the course record in
Abu Dhabi, but finished the tournament three shots adrift. She concluded her year with five top-10 finishes in succession on the Ladies European Tour with a tied-5th finish at the Dubai Ladies Masters in the final event of the year. She ended 2016 at 108 in the world rankings. She entered the
Women's PGA Championship and finished tied-46th. She then finished tied-8th at the
Thornberry Creek LPGA Classic and T51st at the
U.S. Women's Open. Hall then made her debut for the European team in the
2017 Solheim Cup. Europe were defeated 11.5–16.5 by USA at
Des Moines Golf and Country Club,
Iowa. She finished the event with a 2–3–0 (win–loss–tie) record and lost to Paula Creamer (1 up) in the singles on the final day. Reflecting on the tournament, Hall said: "It was an incredible experience throughout every minute. I already cannot wait for two years time." Hall finished tied-3rd in the
2017 Women's British Open, five strokes behind champion
In-Kyung Kim at
Kingsbarns. She then finished tied-10th at the
Evian Championship, the final major of 2017. Hall won the Ladies European Tour Order of Merit in 2017 after recording seven top-10 finishes during the
season. These included a tied-4th at the
Lalla Meryem Cup and tied-9th at the
Women's Scottish Open. After winning the Order of Merit, Hall said: "It was one of my targets at the start of this year and I’m over the moon...this is one of the biggest moments in my career." In December 2017, she successfully made it through
qualifying school to earn her LPGA tour card. In February 2018, Hall finished in a tie for third at the ALPG Oates Victorian Open, and she followed this up by finishing T9th at the
Canberra Classic. She secured her first LPGA top-10 finish of the year at the Thornberry Creek LPGA Classic in July, where she finished tied-7th. Hall won her first major championship at the
2018 Women's British Open in August, finishing two shots ahead of
Pornanong Phatlum at
Royal Lytham & St Annes. Hall hit six birdies in her final round 67 to become the fifth British winner of a ladies major. Afterwards: Hall said, "It was my goal when I was nine years old on the putting green: 'This six-footer's for the British Open' and to actually have that, and luckily it was just a tap-in, I'm over the moon." She ended the season by winning her second consecutive Ladies European Tour Order of Merit, becoming the youngest player to defend the title. Hall was also named the Players' Player of the Year on the Ladies European Tour, and she finished the year eighth in the world rankings. At the end of the year, she was named
Sunday Times Young Sportswomen of the Year. In August 2019, Hall finished tied-35th in her defence of the
Women's British Open at Woburn. Before the tournament, she revealed that her replica trophy from her win in 2018 had been stolen from her car two months previously. In the
2019 Solheim Cup at
Gleneagles Hotel,
Scotland. Hall won all four of her matches to help Europe to a 14.5–13.5 win over USA. She won three matches partnering
Céline Boutier and then beat
Lexi Thompson 2 and 1 in the final day singles. On the LPGA Tour in 2019, she recorded three top-10 finishes, with a best placing of tied-4th at the
Volunteers of America Classic. Hall's world ranking dropped to 41 at the end of the year. In September, she won for the second time on the LPGA tour. Her maiden win in the United States was secured at the
Cambia Portland Classic, where she overcame
Ashleigh Buhai in a sudden-death playoff. Prior to the playoff, Hall had held a one-stroke lead with one hole remaining, but scored a bogey, before triumphing at the second playoff hole. In November, Hall hit a seven-under-par 64 in her opening round to set a new course record at
Royal Greens Golf and Country Club in the
Saudi Ladies International. She finished runner-up, after
Emily Kristine Pedersen defeated her in a playoff. Hall declined the opportunity to compete for Great Britain at the
Tokyo Summer Olympics in 2021, citing concerns about her "exhausting schedule" and the effect it would have on her preparation for upcoming events. She then finished tied-6th at the
2021 Evian Championship in France. She shot a 64 in the final round to finish the tournament 13-under-par, five strokes behind tournament winner
Minjee Lee. In the
2021 Women's British Open at
Carnoustie, Hall shot a five-under-par 67 on the final day to finish in a tie for second, one shot behind
Anna Nordqvist. Hall was a member of the European team that triumphed 15–13 over USA in the
2021 Solheim Cup at the
Inverness Club,
Toledo, Ohio. She finished 1–2–1 from her four matches with her win coming in the
foursomes with teammate
Leona Maguire. They beat
Yealimi Noh and
Brittany Altomare 1 up. In the singles, Hall was defeated by
Nelly Korda 1 up. During 2021, Hall recorded six top-10 finishes from eight starts on the Ladies European Tour, but with no victories. Hall came close to winning the Aramco Series-London in June, but finished runner-up after
Bronte Law made a 50-foot eagle putt at the final hole to claim victory. At the
2022 Evian Championship, she finished tied-8th, marking her third top-10 finish in her last six majors. In August, she finished tied-22nd in the
Women's British Open at
Muirfield, and then finished third at the
ISPS Handa World Invitational in
Northern Ireland. Hall finished 2022 at 25 in the world rankings. The following week, at the
Los Angeles Open, she finished runner-up for the second week in succession, this time by one stroke to
Yin Ruoning. During her third round in
Los Angeles, Hall made two eagles and five birdies to equal her career best round of nine-under-par. She also finished tied-12th at the
2023 Chevron Championship, but her form then dipped and she missed the cut at two of the next three majors. In the
2023 Solheim Cup at Finca Cortesin in
Casares,
Andalusia, Hall finished with a 1–2–1 record. Her win came in the day one
four-balls with Leona Maguire when they defeated Lexi Thompson and
Lilia Vu 1 up. In the singles, she finished in a tie with
Andrea Lee. Europe and USA finished tied on 14 points, meaning that Europe retained the trophy. Hall was selected by Great Britain for the
2024 Summer Olympics in
Paris. She finished tied-36th on five-over-par, 15 strokes behind gold medalist
Lydia Ko. In August 2024, Hall was named by
Suzann Pettersen as one of her wildcard picks for Europe's
2024 Solheim Cup team at the
Robert Trent Jones Golf Club in
Gainesville, Virginia. Explaining her choice, Pettersen said: "She has a great Solheim record and I really like her style in matchplay." Hall won two of her four matches, including a 4 and 3 victory against Andrea Lee in the final day singles, but could not prevent USA securing the overall victory. She finished the tournament with a 2–2–0 record. At the end of a difficult year, her ranking dropped to 65, and Hall said: "You always have a year which isn't your best and this year that's happened to me." She only recorded one top-10 finish in her first eight tournaments of 2025, missing five cuts, and saw her ranking fall to number 95. Hall consequently missed out on an appearance at the
2025 U.S. Women's Open, marking the first time since 2016 that she had missed the event. ==Personal life==