She is best known for her lead role as swimmer Mercedes Gleitze in the 2024 biopic Vindication Swim.
[1] Callaghan began her career on stage, writing, and performing in one-woman show L'amour Est Mort, based on the French folktale Bluebeard, which was chosen to be performed at the London Symposium Festival.
[citation needed] In 2016, Callaghan was cast as Nöel Olivier in Nick Baldock's historical play Verge of Strife,[citation needed] and then in the lead role of Thomas Clancy's play, Pussy.
[5] The film, written and directed by Elliott Hasler, portrays the story of Mercedes Gleitze, who in 1927 became the first British woman to swim the English Channel.
[13] Vindication Swim was released in 2024 and marks Callaghan's feature film debut.