Hildeng was elected to the Norwegian Parliament from Oslo in 1997, and was re-elected on two occasions. At a local level, Hildeng held various positions in Oslo city council from 1971 to 1975 and 1991 to 1997. She chaired the local party chapter from 1993 to 2000. From 1995 to 2001, she was a member of the Labour Party central board. She died on 12 September 2022, at the age of 79.[1]
