Following in her mother's footsteps, Ridley became politically active as a young woman. She was involved in the early women's suffrage movement and was an anti-lynching activist. With her mother and
Maria Louise Baldwin, Ridley co-founded several non-profit organizations. They founded the
Woman's Era Club (later renamed the New Era Club), an advocacy group for black women, in 1893. At the club's first meeting, Ridley announced that the club would be led by black women, but open to women of any race. One club project was to raise funds for a kindergarten for the Georgia Educational League: working in its support, Ridley spent three years in Atlanta, Georgia. The women also created ''
The Woman's Era'', a newspaper for distributing club news nationally. In 1895 they organized a national collaboration that later became the
National Association of Colored Women's Clubs. Ridley and Ruffin reached out to clubs around the country to organize the
First National Conference of the Colored Women of America. Ridley's role in preparation was as the corresponding secretary for the Committee on Arrangements. Ruffin led the conference, with delegates attending from women's clubs across 16 states. During the conference, Ridley served on committees on lynching, the Georgia convict lease system, and Florida school laws. Ridley had a special interest in black history, and also co-founded the Society for the Collection of Negro Folklore in 1890. This was one of the earliest organizations dedicated to black folklorists. Ridley was a member of the board of directors for the Robert Gould Shaw Settlement House from 1919 to 1925. In 1929, she was elected to be the Lewis Hayden Memorial Association's secretary. She also collaborated with the Urban League. ==Writing career==