 She quickly established herself as a lecturer on literary and social reform topics, debating in London at the Sunday Lecture Society, appearing before the London Dialectical Society (which was engaged in investigating the phenomenon of Spiritualism; James Edmunds, the founder of the Ladies' Medical College was a committee member); and giving talks throughout the country.She was an early and vocal advocate of women's suffrage and, later, in 1889, was one of the founders, with Emmeline Pankhurst, of the Women's Franchise League.Miller also wrote, as journalist and author of fiction and non-fiction.