During the May Days of 1937 in Barcelona, she was arrested on the front line at Guadalajara by stalinist communist agents. Having been jailed in Madrid, she was liberated thanks to Cipriano Mera's direct intervention. Once liberated, she joined the anarcho-feminist group known as the "Mujeres Libres". She fought on the front line until June 1938. After that date, women were sent to the backside.