A novelist and analytical psychologist, whose family home was Lamledra House, near Gorran Haven.
She was the third daughter of the international lawyer Sir John Fischer Williams and his wife, the artist Eleanor Marjorie Hay Murray. Her sisters were the historian and civil servant Jenifer Margaret Hart and the medical doctor Mariella Fischer Williams.
She studied at Newnham College, Cambridge, graduating with a First-class degree in History. In Cambridge, she met David Hubback, the son of Eva Hubback, and they married in 1939.
In the late 1940s, Hubback became aware of her mother-in-law's social studies on working-class housewives. From this work, she became increasingly interested in women's attitudes towards work and self-funded her own postal surveys as part of a project to explore the lives of highly educated married women in Britain. She published the results of her surveys in 1954 as a pamphlet, Graduate Wives. She was a member of Hypatia Trust.