Her parents, Carlos Díaz de Mendoza [es] and Carmen Larrabeiti, who were both actors, had married the previous year.

She embarked on her stage career in the 1940s at the Theatre of María Guerrero, originally purchased by her grandfather, the theatrical impresario Fernando Díaz de Mendoza y Aguado, back in 1908.

She was part of the production of En la ardiente oscuridad by Antonio Buero Vallejo, which had its triumphant premier in December 1950 at the Teatro María Guerrero.

There were other successes during the early 1950s in the theatre that still bore her grandmother's name, including "María Antonieta" (1952) and "El jefe" (1953) by Joaquín Calvo Sotelo [es],[5] "Berkeley Square" (1952) by John L. Balderston and "Recién llegada" (1953), by Keith Winter.

A year later, after playing in a theatrical version of La vida en un hilo by Edgar Neville, she retired from the stage.