In Amsterdam, she studied ballet with Sonia Gaskell before moving to London in 1948 to continue her ballet training with Marie Rambert and perform as a chorus girl in West End musical theatre productions. She spoke several languages, including English, French, Dutch, Italian, Spanish, and German.
https://en.wikipedia.org/wiki/Audrey_Hepburn

Audrey Hepburn dancing 'en pointe' in Secret People