The daughter of Josep Comaposada, a socialist shoemaker, she grew up in a militant and cultivated environment, learning to type at the age of twelve.

During the 1930s, Sánchez and Comaposada taught male and female workers, in elementary instruction courses promoted by the CNT in Madrid.

She wrote mainly for Tierra y Libertad (published by the FAI), Mujeres Libres (of which she was editor-in-chief) and Tiempos Nuevos, where she had a section dealing with subjects ranging from medicine to sexuality.

During the 1960s and 1970s, she continued to collaborate on the publication of Mujeres Libres, Tierra y Libertad and Tiempos Nuevos, and joined other magazines such as Ruta y Umbral.

After the death of Francisco Franco in 1975, she considered writing a book and asked veteran women for letters in which they wrote their own experiences.