Marian studied acting and interpretation with Juan Carlos Corazza.
She debuted on the small screen in year 2000 with an episodic role in the series El grupo. In 2001 she was in episodes of the tv series 7 vidas interpreting Lucia. In the following years she participated in other tv series until joining the cast of Hospital Central in 2007 and 2008. Recently she starred in Teresa, a TV movie for Televisión Española channel.
In 2001 she debuts on the big screen with the short Soberano, el rey canalla, directed by Miguel Bardem. Her first feature film, Incautos, was released three years later, also directed by Miguel Bardem. She then participated in Semen, una historia de amor (Inés Paris, Daniela Fejerman, 2005), A golpes (Juan Vicente Córdoba, 2005), Atropello (Manuel Estudillo, 2006) and Bestezuelas (Carles Pastor, 2010).
For her role in Lo mejor de mi, by Roser Aguilar (2007), she won the Golden Leopard for the Best Actress at the Locarno International Film Festival and the Jury Prize for Best Emerging Actress.
Her breakthrough was in 2013, when she starred in Wounded , by Fernando Franco. For her splendid work in the film, she won several awards, including a Goya for Best Actress, the Silver Shell from the San Sebastian Film Festival, Best Actress in the Toulouse Film Festival and Best Actress in the José María Forqué Awards and the Feroz Awards.
In 2015 she participated in Happy 140, directed by Gracia Querejeta, for which she was nominated for the Goya and the Feroz award in the category of Best Supporting Actress.
In 2016 she appeared in One hundred years of forgiveness of Daniel Calparsoro.
Her last work in cinema is Dying, the new film by Fernando Franco, that will be premiered at San Sebastián Film Festival.