She trained with the National Youth Ballet and the Associates of the Royal Ballet, and at age 15, she was invited to dance with the Kirov at the Royal Opera House for a summer season. She attended Furze Platt Senior School in Maidenhead. At the end of her GCSEs, she was accepted to a number of ballet schools, but chose to go to the Arts Educational School, because of the A-level courses it provided and its pastoral care. Brown Findlay attended for two years; in her second year, she had three operations on her ankles, the last of which went wrong. After encouragement from an art teacher, she finished her education at Arts Educational School, Tring Park and then moved on to a Fine Art course at the Central Saint Martins College of Art and Design. In a 2012 interview with Vanity Fair, Brown Findlay stated, "Growing up, I was completely in love and infatuated with ballet. Ballet was my life completely". However, after three ankle operations, she was forced to leave dancing behind and ended up at university in London, where she discovered the stage, to which she says, "Acting was the element from ballet that I actually loved and missed the most".