Ashton reached the quarter-finals of the 2007 Women's World Masters, beating 1996 finalist Heike Jenkins (Ernst) in the last 16 before losing to
Rilana Erades. The next year, she reached the semi-finals, beating
Anne Kirk in the last 16 and then beat
Australia's Cathy Shaw, before losing to eventual winner
Francis Hoenselaar. Ashton then won the 2008 Women's Zuiderduin Masters, beating
Trina Gulliver in the final. Ashton qualified for the 2009 Women's World Championship and made her debut at the event. She met Gulliver once more in the quarter-finals but was beaten 2–0. In 2010, Ashton got as far as the semi-finals of the
Winmau World Masters, where she lost to
Francis Hoenselaar 4–2. In 2011, Ashton defeated
Trina Gulliver 4–1 to win the Winmau World Masters. Ashton reached the final of the
2013 BDO World Darts Championship after defeating both
Deta Hedman and
Sharon Prins 2–0, before she eventually lost to
Anastasia Dobromyslova 2–1. Ashton hit ten 180s on her way to winning the
2014 BDO World Darts Championship at the
Lakeside Country Club, which had 16 women qualifiers for the first time in its history. She defeated
Aileen de Graaf in the first round, which went to a sudden death deciding leg. She then defeated Tamara Schuur in the Quarter Finals. She then beat Anastasia Dobromyslova, in the semi-final, surviving 6 match darts, before eventually going on to beat
Deta Hedman in the final, 3–2. She successfully defended her title in
2015 with a 3–1 win over
Fallon Sherrock. Ashton then won the
BDO World Trophy, by defeating Anastasia Dobromyslova in the final. At the
Winmau World Masters, she lost in the final to
Aileen de Graaf after missing six match darts. At the
2016 BDO World Darts Championship, Ashton was beaten 2–1 by Trina Gulliver in the quarter-finals. At the 2016 BDO World Trophy, she hit a record three-dart average for a televised women's match of 98.85. In the
2017 BDO World Darts Championship, both Ashton and
Corrine Hammond reached the final without losing a set. Ashton won the final 3–0. Ashton won the
2018 BDO World Darts Championship after she beat Dobromyslova 3–1 in the final. This was her fourth World Championship title in five years. Ashton entered the 2019 PDC Qualifying School. She missed out on getting a tour card by one point. After losing out in the final of the
2020 BDO World Darts Championship to defending champion
Mikuru Suzuki, Ashton became the first woman to win a PDC Tour card through Q-School, by finishing in twelfth place on the
UK Q-School Order of Merit. On 5 March 2021, she became the first female to win a match at the UK Open since 2005, defeating Aaron Beeney 6–2 in Round 2 of the
2021 UK Open, and, also setting a new world record, for the highest average of 100.3, on TV, by a female player in her victory over Beeney. In the
2022 PDC World Darts Championship she lost 3–0 to
Ron Meulenkamp in the first round and also lost her PDC tour card. She didn't win it back at Q School. In February, she played in the
2022 World Seniors Darts Championship and got a bye into second round, where she lost 1–3 by sets to
Terry Jenkins. Ashton qualified for the
2022 Women's World Matchplay by being in the top 8 in the PDC Women's Series after 12 events. She beat
Chloe O'Brien 4–0 in the Quarter-finals but lost 5–4 to
Aileen de Graaf in the semi-finals. Ashton played at the
2023 PDC World Championship. She was defeated in the first round by
Ryan Meikle 3–2. In 2025, Ashton won the
Women's World Matchplay for the first time; she defeated
Robyn Byrne,
Beau Greaves and
Fallon Sherrock en route. At the
2025 Grand Slam of Darts, she took a 4–3 lead against
European champion
Gian van Veen in her opening group stage match. She lost the match in a deciding leg, and was eliminated from the tournament following losses to
Josh Rock and
Wessel Nijman. At the
2026 PDC World Championship, Ashton lost 3–0 to
Michael Smith in the first round. ==Personal life==