Cave made her acting debut in 2009 in the made-for-television movie called
May Contain Nuts. In 2012 Cave was cast as Young Biddy alongside her sister in the 2012 film
Great Expectations. In 2013 she starred opposite
Helen Mirren in the 2013 play
The Audience.
The Daily Telegraph described her as a "revelation" who gives a "performance of blistering pathos and real comic punch." In 2021 Cave narrated the audiobook for sister Jessie's debut novel,
Sunset, and was included in the Publisher's Association
Best New Voices 2021 list for her narration. The novel was partly inspired by their relationship. In 2022 Cave returned to stage in
Daddy Issues at the Seven Dials Playhouse. In 2024 Cave made her solo show debut at the
Edinburgh Comedy Festival with her one-woman show,
The Screen Test, having previously appeared in her sister's first Edinburgh show
Bookworm in 2012. == Personal life ==