[12] On 20 November, Simpson made her competitive debut for United in the 2024–25 League Cup against Everton, as a 60th minute substitute for a 2–0 victory.
[13] In January 2025, 90min referenced Simpson as one of six players who could be likely looking for a loan spell, having recovering from her ACL injury the previous season, and being "low down in the "pecking order" for her position at United.
[15] On 14 September 2023,[16] on deadline day,[4] Simspon joined newly promoted Women's Super League club Bristol City on loan for the 2023–24 season.
[17] On 21 October 2023, Simpson returned to United having suffered an anterior cruciate ligament injury during the League Cup match against Southampton.
[21] On 11 October 2022, for 2023 U19 Championship qualification, Simpson scored her debut youth international goal for the England under-19s in a 1–1 draw with Denmark.