In 1931, she became a member of the Socialist Party and ran for office in the partial elections in October 1931 as a candidate for the Agrupación Socialista in Badajoz. She was elected to the Constitutive Parliament. She also won the elections of November 1933 and February 1936. Although she was a feminist, she rejected the Spanish women's right to vote, arguing that they were not ready for it. A fervent advocate of the Agrarian Reform, she was the victim of the attacks from the right because her ethnicity and her feminist background. After the Asturian Revolution of 1934, she was accused of military rebellion and left Spain. While in exile, she lived in Paris and visited Scandinavia and the Soviet Union, raising funds for the victims of the repression. She returned to Spain in 1936. After the beginning of the Spanish Civil War, she remained in Madrid, organizing the transfer of the artistic treasures of Toledo to the vault of the Bank of Spain in order to protect them and giving radio speeches in order to rise the morale of the militiamen. Then, disappointed by the leadership of Largo Caballero, she left the PSOE and joined the Communist Party (PCE).