[1] At the age of 11, O'Prey made her feature film debut in Juan Carlos Medina's 2012 multilingual horror Painless as Inès.
[4] In 2015, O'Prey appeared in two French television films: My Son as Héloïse and Eyes Open as Clara.
[5][6] She then landed the recurring roles of Tatiana in the French series Mortel and Beatrice, an Irish exchange student,[1][7] in Damien Chazelle's miniseries The Eddy, both on Netflix.
In 2021, O'Prey starred as Julia the Elder in the Sky Atlantic and Italia historical series Domina and made a guest appearance as the titular character in the Capitaine Marleau episode "Claire obscure".
[8][9] In September 2021, it was announced O'Prey had joined the main cast of the upcoming BBC and Canal+ series Marie Antoinette.