Mackay became a member of the
Communist Party of Australia and was involved with the Communist Party Central Education Committee. She also worked as a tutor in the Marx School, running classes on the Australian government and history. She was also a member of the
Women's International League for Peace and Freedom. In 1989, she wrote ''Women's sphere : a summary of the movement for women's electoral reform and representation in Victoria.'' This book included a brief life of Australian feminist and social activist
Bessie Rischbieth and a short history of the League of Women Voters of Victoria. In 1994, Mackay was interviewed by Ann Turner. In the interview, she spoke of her early life, her involvement with the Australian Communist Party, and her work during World War II. She also spoke of the difficulties she experienced after returning from the 2nd World Peace Congress, and her later work on behalf of the Peace Council and the
Seamen's Union. == Death and archives ==