Born at Unley in Adelaide to smith John Forster and Sarah Jane, née Jarvis, she received a private education before becoming a governess and piano teacher; she also attempted freelance journalism, and lost the sight in one eye in an accident with a horse and trap.
She married journalist Alfred Howard Young at her father's home in East Adelaide on 23 January 1889.
She became secretary of the Effective Voting League in 1897 as Jeanne Forster Young and named Catherine Spence as an inspiration.
A justice of the peace from 1917, she was secretary of the Women's Representation League in 1918 and was an active member of the board of the Public Library, Museum and Art Gallery from 1916, finally retiring (when almost blind) in 1928.
She campaigned for Effective Voting in England and attended a Commonwealth League conference for the Women's Non-Party Association, a South Australian organisation of which she had been a founding member in 1909.