During the First World War, Gunn became active in welfare work for Australian servicemen overseas. At the end of the conflict she began campaigning for the welfare of returned servicemen, liaising with government departments and becoming a patron of the Monbulk RSL, attending every event they organised over two decades.
In the First World War, Gunn engaged in welfare activities for Australian troops stationed abroad. After the conflict concluded, she took up efforts to support veterans' welfare, working closely with governmental bodies and serving as a patron of the Monbulk RSL, participating in every event they organized over two decades.