Born in Portbou, Spain, she was the sister of the poet and art critic Rafael Santos Torroella. Her son is the painter Julià Grau Santos. In 2005 she received the Creu de Sant Jordi.
In 1931 she presented a solo exhibition in Paris.
In 1932 she participated in the Iberian Artists Collective in Copenhagen and Paris. In 1933 she was invited to the exhibition at the Carnegie Institute in Pittsburgh (United States) and on 1936 she figured of the Spanish Pavilion at the Venice Biennale.
She was presented in Barcelona for the first time in 1935 at Syra Galleries. She turned 100 in November 2011.
Torroella died on 3 October 2013, at the age of 101.