She spent a year on the staff of the university as Assistant to the Director of Tutorial Classes and Lecturer in History.

She strongly supported the push for conscription, often appearing on the same platform as the NSW Premier, W. A. Holman, and insisted that soldiers should not be returned to Australian society until they were physically and mentally fit.

[8] She represented the Australian Equal Citizenship Federation at the International Woman Suffrage Alliance summit in Paris in 1926.

[11] In it she recalls her education and early career in Australia, her work with the British Commonwealth League and her time with Maude Royden.

While continuing to represent Australian feminists, Collisson spent most of her life in London, living in hotels, and in later years, the Nightingale House care home, Twickenham.