She is known for her roles as the shield-maiden Torvi in the History series Vikings (2014–2020) and Becky in the zombie horror movie Ravers (2018).

[3] In 2018, Hirst was the sole actor in the Stephen Gates directed short film Dungeness,[4] and starred as Becky in the 2018 techno music zombie horror movie Ravers,[5] which had its world premiere at the 2018 London FrightFest Film Festival.

[7] In 2021, Hirst joined The Celebs to record a cover of The Beatles classic "Let It Be", in support of the Mind charity and released on 3rd December 2021.

Hirst was part of a choir of celebrities including Anne Hegerty, Ivan Kaye and Eunice Olumide, who were backing EastEnders actress Shona McGarty.

[8][9][10] In 2017, Hirst made an appearance on Sky News where she urged young female fans to go ahead with smear tests after she had herself been diagnosed with precancerous cells at the age of 22.