Magnin was born in Málaga in 1990 to a French father and a Morocco-born Italian (Sicilian) mother.

[2][3][4] She moved to Madrid to finish a law degree, but upon completing it, she joined a theatre workshop to pursue an acting career instead.

[3] She made her feature film debut in the black comedy Advantages of Travelling by Train (2019).

[3] She portrayed Dora Maar in season 4 of the television series El ministerio del tiempo.

[5] She has since featured in television roles as cabo Martín in Fuerza de paz [es],[2] Paola Malinverni in Mía es la venganza [es],[6] Doña Carla de Morcuende in La Moderna,[7] and in a minor part as a tour guide in The Crown's season 5, likewise featuring in films such as Piggy (2022) and How to Become a Modern Man (2023).