She began a nightly rescue work for prostitutes, a "flower mission" at the Adelaide Hospital, and a Dorcas society with clothes for the poor.
[1] In 1905, she presented a paper to the first interstate conference of city missions, which was well received,[1] although she later claimed it had been written by a male colleague and she just read it.
[1] She was paid a minimal salary for many years, and only after women joined the organisation's committee was her wage raised to that equivalent to a female factory worker.
[2] Green's supporters protested, and she was appointed superintendent of the entire mission in 1923, offering various welfare services in Light Square and turning the North Adelaide site into a hostel for Aboriginal women and children.
[5] During the Great Depression, South Australian Premier Richard Layton Butler approached Green to assist with accommodation for homeless men and she oversaw extensive relief work, running some of the Welfare Department's services for a time.