She was the daughter of newspaper editor Kristoffer Anker Olsen and Ingeborg Cappelen Hille Finne.
[2] Sossen Krohg graduated from the Det Norske Teatret school of theater in 1946 and made her stage debut in the play Kranes konditori which was based on the novel from 1945 by Norwegian author Cora Sandel (1880–1974).
She made her film debut in Døden er et kjærtegn from 1949 directed by Edith Carlmar (1911–2003).
She also published the memoir book Hekletøy med store hull (Oslo; Gyldendal, 1986).
From 1998 onward she played the character "Astrid Anker-Hansen" in the television soap opera Hotel Cæsar.