Born in Tring in Hertfordshire, Janes was educated at a school in Chesham before undertaking voluntary work, initially managing various clubs associated with the church in Apsley, then later as secretary of the Girls Friendly Society in St Albans and then as the volunteer matron of the Magdalen Hospital in Streatham.
[2] In 1882, Janes met Ellice Hopkins, the two being introduced by Louisa Hubbard, and worked for four years as her private secretary.
[2] She was motivated in these efforts by a strong religious belief, holding that "right" would ultimately triumph.
[3] Janes also became the founding secretary of the Central Conference Council, a body established in 1891 by Hubbard to co-ordinate local organisations representing women workers.
[2] Janes devoted much of the remainder of her life to the NUWW, although she also found time to edit the Englishwoman's Yearbook and Directory.