She was the eldest daughter and heiress of the Parliamentarian and landowner August Tamm and Baroness Emma Åkerhielm af Margrethelund. She and her sister Märta was schooled at home by a governess, and was also instructed in how to manage an estate by their father. She attended lectures at the Uppsala University; however, in 1905 she inherited Fogelstad Manor from her father, and abandoned her plans to study in order to attend to her estate. She never married. Her father being a politician, Tamm showed an early interest in politics and the growing women's movement.
Political career
Being an unmarried woman of legal majority as well as a wealthy property owner, she fulfilled the criteria which made her qualified to vote in municipal elections in accordance with the 1862 law, and when women became eligible in municipal elections in 1909, she became engaged in local politics. She was the deputy chairman of the Communal Council of Julita in 1913, the chairman in 1916, and a member of the board of directors of the city council in 1919–1930. She was the chairman of the independent non-party political women's organisation Frisinnade kvinnors riksförbund of Södermanland in 1922–1931, and municipal communal speaker for Julita in 1933–1936. In 1921, she became one of the five first women to be elected to the Swedish Parliament after women suffrage alongside Nelly Thüring, Agda Östlund and Bertha Wellin in the Lower chamber, and Kerstin Hesselgren in the Upper chamber. She focused on women's rights issues, such as equal salaries for women and the access to all official professions for both sexes. She was originally engaged within a Liberal party, but was from 1924 an independent. She served as MP until 1924. She continued to be active in municipal politics after she left parliament. She retired from politics for health reasons in 1936.
Tamm wrote for the women's rights movements papers Tidevarvet and Vi kvinnor. She also financed Tidevarvet and a Norwegianwomen's magazineKvinnen og Tiden. In 1925, she initiated the Kvinnliga Medborgarskolan on her estate Fogelstad, where she served as chairman. She was also active within ecology and wrote the bookFred med jorden with Elin Wägner in 1940.
