[1] Karr was one of the most ardent Catalan feminists of the early 20th century, together with Dolors Monserdà with whom she collaborated.

Her feminist philosophy, which promoted giving women the necessary tools for a profession, as well as equal rights, was frequently a subject in the journal Feminal, which she edited from 1907 to 1917.

She also wrote for Diario de Barcelona, La Veu de Catalunya, Or y Grana,(1906–1907, where she promoted Catalan solidarity), Ofrena (1916–17), La Mainada (1922–23), La Actualidad, Día Gráfico and Las Provincias of Valencia, where she sometimes used the pseudonym Xènia in reference to the name Xènius used by Eugenio d'Ors, with whom she argued in Joventut.

[citation needed] Though born in a foreign family, Karr was fully integrated in Catalan cultural life.

She wrote articles in Spanish and Catalan under her own name in Diario de Barcelona, El Día Gràfico and in Las Provincias.