miller was also involved in anti-conscription activism over the course of world war i. she joined the women's peace army when cecilia john and adela pankhurst visited brisbane in 1915, and was elected president. the following year she attended the australian peace alliance conference in melbourne, and is reputed to have attended the yarra bank where she denounced militarism from her soapbox. the no campaign against the first conscription ballot on 28 october 1916 was a success, attributed by many historians to the strong women's anti-conscription campaign.