[2] She started her career in 1922 as a volunteer assistant in the Balmes High School (Barcelona), and she became a permanent teacher in 1928.

She married the Jewish historian Josep Maria Millàs i Vallicrosa [Wikidata] in 1935 and took leave until January 1938, when she started to work in a high school in Vilafranca del Penedès.

She went back to work in the Balmes High School after the Civil War, and she published several academic papers on Medieval history.

[3] Vendrell published her studies in several scientific journals such as Sefarad.

Her research focused mainly on the reign of Ferdinand I and the role of Jews and converts in the Crown of Aragon during the 15th cent.