She was the daughter of Enrique Mulder García, (Marquis of Tedema Toelosdorp of the Netherlands) a doctor and son of Dutch Spanish parents, and Zoraida Pierluisi Grau, a Puerto Rican of Italian and Catalan descent.

[2] In 1919 Mulder won a poetry competition with her poem "Circe" and around this time she also began her journalistic collaboration with El Noticiero Universal in Barcelona, where she took charge of the section on English literature, where she specialised in critiqueing Victorian novels.

She also developed children's literature and theatre (Casa Fontana and Romance de media noche) in collaboration with María Luz Morales.

During the war she suffers a serious case of nephritis that kept her in bed for a year, during which she wrotes Prelude to Death, a novel that was eventually published in 1941 and which had issues with the censors due to the suicide of the main character.

In 1944 she published one of her most famous works El hombre que acabó en las islas, which largely recounts the process of learning and maturity of a young man in Spain, the Nordic countries and finally Puerto Rico, where she recreates the atmosphere of her own childhood.

In 1976 she translated the children's book La lente mágica (The Magic Lens) by Swedish photographer and children's writer Astrid Bergman Sucksdorff.Mulder continued to alternate mix writing fiction with journalism, contributing to La Vanguardia Española, Destino and Solidaridad Nacional of Barcelona, ABC of Madrid and Índice Literario of Caracas, among others, and in 1954-1955 she was in charge of the "Letras inglesas" section of Ínsula of Madrid.

In the 1980s she gradually lost her sight, but succeeded in finishing a novel, El retablo de Salomé Amat, which she claimed she had been working on for more than twenty years.

Antología de mujeres poetas en torno a la Generación del 27, published by the Fundación José Manuel Lara in the Vandalia collection.