[4] In addition to playing sport with her sister Claudia, Castle took weekend Stagecoach drama classes as well as singing and ballet lessons.

Castle attended Alleyn's School,[5] where she completed A Levels in English literature, religious studies, and psychology.

[10] After graduating from drama school, Castle played Lisa Houseman on the 2015 UK tour of Dirty Dancing.

[13] Castle appeared in Andrew Lloyd Webber's Cinderella for its short-lived 2021 run at the Gillian Lynne Theatre.

[15] Also in 2022, Castle starred as Jovie opposite Simon Lipkin in the West End revival of Elf at the Dominion Theatre.