Bang was born in Oslo as the daughter of industrial manager Alf Bang and Dagmar Kathinka Hansen. She grew up in an isolated and protected environment in Oslo, while the summers were spent at the family"s summer house in Veierland, Vestfold, where she was influenced from old coastal culture.
After examen artium in 1947 she worked five years as a secretary in Oslo, while she wrote her first books Bang made her literary debut in 1949 with two light reading novels, while the novel Glemte vinger from 1951 is regarded as her debut as a serious writer Other novels were Fjerne seil (1962) and Blåst om babord–! (1964).
Her novel Blues (1968) from the drug scene was the basis for a film from 1969, called Psychedelica Blues.
Her trilogy Bedremannsbarn (1973), Borgersinn (1974) and Nye veier (1979) is a family chronicle from the early 1900s. Her double novel Jutøy, consisting of Havet ble blod (1978) and Jag etter vind (1981), are historical novels from the whaling pioneer time in Vestfold between 1809 and 1905.
The story takes place at the fictitious island Jutøy and among whalers at the polar sea, and is also picturing whaling pioneer Svend Foyn. Bang is a passionate collector of ancient dolls, and she edited the anthology Har dukkene sjel? (1985), where she contributed with an article on the cultural history of dolls.
She has written two children"s books, Lotte på loftet (1992) and Katten på Sjørøverøya (1994).
She has also written two crime novels, Mord i måneskinn (1956) and Seilas medical døden (1960).
She was a member of the Norwegian Authors" Union"s literary council for several periods.
