“She told the Daily Mirror newspaper: "I trained in dance from the age of three and then I left home at the age of 16 to go to a musical theatre college."
See here. That isn’t the only reference I’ve seen to her ballet training but the first I can find.
Edit: Independent. Like her fellow Strictly 2024 contestant Tasha Ghouri, Hadland already has some dance experience, having trained in ballet from the age of three. Ahead of landing an acting role, she started her career dancing in West End musicals, including Cats and Grease when she was 19.