Sue ... I have found mention of Grace in the 1924, 31 and 36 Australian Electoral Rolls. In 1924 she is in Kooweerup, and 31 and 36 in Leongatha.
On her death certificate that I bought this afternoon, she is said to have lived in Victoria for about 25 years. (An authorised agent was the informant so that would possibly account for the guesstimate.) Would her early years at Heathcote be included in that number of years?
My guesstimate then would be that the earliest she returned to Victoria would be about 1912.
Hope that makes sense Sue.
Elsie