Between 1924 and 1926 she was active in the World Union of Socialist Zionists in Europe, and in 1926 they immigrated to the British Mandate of Palestine. Yisrael worked for the party and became secretary of the workers of Petah Tikva while Beba worked in agriculture (she would later divorce Idelson and marry Haim Halperin). From 1927 to 1928 she worked as a statistician for the World Zionist Organization and then joined the Ahdut HaAvoda party. In 1930 she became secretary of the “Council of Working Women” and led several women's organizations. She was a delegate to the Vaad Leumi (National Council for Jewish Communities in pre-State Israel) and contacted many socialist leaders, arguably including Leon Trotsky in Mexico in October 1937.
During World War II she and Hadassah Samuel from the Women's International Zionist Organization were the prime movers behind the volunteering of Jewish women from the Yishuv to the British army. A total of 3,200 women served in the Auxiliary Territorial Service, and 789 in the Women's Auxiliary Air Force.
After the State of Israel was established in 1948 she was a member of the Provisional State Council and also headed the Flag and Emblem Committee, which eventually chose the Emblem of Israel. She was then elected to the first five Knessets for Mapai (from 1949 to 1965). She was a member of the Constitution, Law and Justice, House, Foreign Affairs & Defense and Labor Committees. She promoted social reforms and women's equality and opposed the religious coercion. She also supported applying the mandatory draft to the IDF to women as well as men. In 1960 she was chairwoman of the Histadrut's ninth Committee and was its member until 1965. From 1968 to 1975 she was chairwoman of the World Movement of Pioneer Women. She retired from the Council of Working Women in 1974. She died in 1975.