Pastor studied at the School of Dramatic Art of Valencia (ESAD). She had classes under Antonio Díaz Zamora, Antonio Tordera and Francisco Romá (director of the film Tres en raya). She acted in Ken Loach's 1995 film Land and Freedom, alongside Ian Hart and Icíar Bollaín.
Apart from her extensive career as a film and television actress, she has also worked on stage. She featured in plays such as Pessoa en Persona; Les Troyens; Uncle Vanya; La pell en Flames; and as "Joan of Arc" at the Palau de les Arts, with the Orchestra and choir of the Cor de la Generalitat Valenciana. She directed and narrated the show "Enoch Arden", that integrates the music of Richard Strauss, narration and singing.