She made appearances in
Valerian and the City of a Thousand Planets (2017) and
Arthur, malédiction (2022). She played the role of Tabitha in
Dangerous Waters in 2023. She filmed apocalypse love story ''
When I'm Ready'' in 2022. In 2023, she was cast in the fantasy horror film
Triton alongside
Raff Law and
Freya Allan. In 2024, she had the role of Geneviève in season four of
Netflix series
Emily in Paris. Her character was described as the show's "first villain".{{cite web|url= https://www.elle.com/uk/life-and-culture/culture/a62236093/thalia-besson-emily-in-paris/|website=Elle.com|accessdate=28 November 2024|title= All About Thalia Besson, Emily In Paris' First Villian ==Personal life==