She took speech and drama lessons with a local woman, Robin Fraser, who encouraged her to develop her skills in performing and writing.

[8] From 2010 to 2011, she appeared in The Diary of a Madman (a theatrical adaptation of the Gogol short story), a role for which she was again nominated for Best Supporting Actress at the Sydney Theatre Awards.

[8] In February 2011, she travelled to New York City to perform in the Brooklyn Academy of Music's production of The Diary of a Madman,[8] before returning to lead roles in A Golem Story, Summer of the Seventeenth Doll, and As You Like It in Sydney.

[5] After four months in New York, she was cast in the Netflix series Orange Is the New Black, a show set in a women's prison.

[15] Stone started dating Jack Manning Bancroft, founder of Australian Indigenous Mentoring Experience.

[18] On 16 December 2018, The New York Times published an interview with Stone in which she accused Australian actor Geoffrey Rush of sexual misconduct during the production of The Diary of a Madman in 2010 and 2011, including inappropriate texts and unwanted touching.

[20][21] On 7 January 2020, midway through the 2019-2020 Australian bushfire season, Stone announced her intention to give up her US green card and return to live permanently in Australia and become involved in the "climate war".