Born in Southwark,[2] to Richard George Cox, a bootmaker, and his wife Harriet, Hicks grew up in the house of her uncle, Thomas Francis Dicksee.
[5] Inspired by her father's experience in the Chartist movement, Hicks joined the Democratic Federation in 1883, along with her husband and her daughter, Margaretta.
She was elected to the executive council of the renamed Social Democratic Federation (SDF) in 1884, serving for a year.
[3] In 1894, she joined the Trades Union Congress' delegation to the American Federation of Labour, with John Burns and David Holmes.
In 1896, she worked closely with Charlotte Perkins Gilman, who toured the UK giving speeches on women's suffrage.