[2] On 8 June 2020, Reading announced that Allen had left the club after her contract had expired.

[3] On 22 August 2020, Leicester City announced their signing of Allen ahead of the 2020–21 season, among seven other FA WSL players, as they embarked on their journey as a fully professional club.

[9] While still playing at Birmingham City in the 2023–24 season, Allen joined the England women's under-23s as an assistant coach.

[10] On 2 March 2024, London City Lionesses announced the appointment of Allen as head coach until the end of the season.

[citation needed] Allen was named the league's Manager of the Month for March 2024 after the Lionesses won their first three matches with her in charge.