Her first steps into the world of acting were small roles in theater[3] and the film El árbol de la sangre, directed by Julio Medem, in which she co-starred with Úrsula Corberó and Álvaro Cervantes.

[4] Subsequently, Planas was selected out of a pool of numerous teenagers auditioning to play the lead role of Eva in the first season of Skam España.

[6] Skam España premiered in September 2018, with Planas' character Eva as the central protagonist in the first season of the show.

[8] In 2021, she joined the cast of the first original series of Starz Spain's Express, along with Maggie Civantos and Kiti Mánver.

[9] In May of the same year, she joined the cast of Prime Video and Mediaset España's Días mejores series, where she plays Graci.