Shields was born on 18 December 1941 in Wellington, and was educated at
Wellington Girls' College from 1955 to 1959. She campaigned for women's rights throughout her career. In 1966, she was one of a group of Wellington women (members of Newlands
Playcentre) who founded the
Society for Research on Women (SROW). She was a founding member of the
Women's Electoral Lobby (WEL) in 1975 which aimed to get more women into parliament and public offices. She worked at the Department of Statistics from 1973 to 1981, and served on the
Wellington Hospital Board from 1977 to 1980. ==Political career==