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. In 2016, Callaghan was cast as
Noël Olivier in Nick Baldock's historical play
Verge of Strife, and then in the lead role of Thomas Clancy's play,
Pussy. In 2019 Callaghan was cast as the lead role in the biopic
Vindication Swim. 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. Callaghan spent three years training and filming for the swimming scenes, which were all filmed in the English Channel itself. Besides starring in the film, Callaghan also served as
executive producer on the project, alongside producers Nicola Pearcey, Sally Humphreys, Douglas McJannet, and Simon Hasler.
Vindication Swim was released in 2024 and marks Callaghan's feature film debut. == Filmography ==