[1] Born at Petersham, a suburb of Sydney, New South Wales, Morrison was the daughter of Charles Henry Victor Emanuel Gibbs, a Victorian-born pastoralist, and his second wife Alexandrina Caroline Elizabeth, née Munro, from Parramatta.

[3] During her classes at Sydney's law school, she witnessed first-hand the prejudice against women in the legal profession, experiencing cat-calling and foot-stomping from her male peers.

[1] In 1923, she took a break from her studies to visit Britain, and subsequently married a ranch owner, Charles Carlisle Morrison in London on 1 October of that year.

She successfully established herself at the Bar and was on occasions briefed by fellow pioneering female lawyers, Christian Jollie Smith and Marie Byles (also a school friend from her P.L.C days), both of whom had been admitted as solicitors in 1924.

[3] With her solid legal knowledge, Morrison was welcomed as a member of the National Council of Women of New South Wales, and was convener of their laws committee.