Blanc was born in Bergen, the daughter of the bank accountant Adolf Christian Blanc (1840–1918) and Magdalene Thomsen (1853–1928).[1][5] She was the niece of the theater historian Tharald Høyerup Blanc (1838–1921).[1] In 1906, she married the actor Henning Eriksen (1878–1922). They divorced in 1915, and in 1918 she married the composer Sverre Jordan (1889–1972). They divorced in 1949.[1]