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 was active in providing support to Australian servicemen overseas through welfare efforts. After the war concluded, she dedicated herself to advocating for the welfare of returning soldiers, working with government agencies and becoming a patron of the Monbulk RSL, attending all their events over two decades.