Thanks Geoff.
Birth 29589/1904 PROWSE HAROLD S - WILLIAM G - LETITIA - ADELONG
The Sydney Morning Herald - Thu 10 Aug 1922 p.6
DEATHS
PROWSE.-August 7, 1922, at Surbiton, Milton-street, Ashfield, Mary Anne, widow of the late James Prowse, of Adelong
So that could be Mary in 1913 but would expect her to be with son W G.
Dave