She attended a Hebrew language primary school and a Russian language high school before immigrating to Mandatory Palestine in 1926. She was a member of Hashomer Hatzair youth movement. She joined the Ahdut HaAvoda political party and was an activist for the Histadrut trade union. After her election to the Tel Aviv workers council, she headed the Women Workers department in 1937- 1940. In 1944-1949, she was a member of the Women Workers Council's secretariat. In 1948, Lamdan joined Mapam. In 1949, she was elected to Israel's First Knesset. She was re-elected in 1951, but on 20 January 1953, she and David Livschitz broke away from the party to form the Faction independent of Ahdut HaAvoda (several other Mapam MKs had broken away to re-establish Ahdut HaAvoda). On 13 January 1954 Lamdan and Livschitz joined Mapai. She lost her seat in the 1955 elections, but returned to the Knesset on 31 July 1957 as a replacement for Ehud Avriel, who had resigned as an MK to become an ambassador. She retained her seat in the 1959 elections, but lost it again in 1961. However, she returned again as a replacement for the deceased Giora Yoseftal on 23 August 1962. On 14 July 1965 she was amongst the eight MKs to leave Mapai, led by David Ben-Gurion, to establish Rafi.