Hi Jenn

Doesn't help really help but.....
New South Wales Electoral Roll
1903
SIMMONS Charles Church Street, West Wyalong Blacksmith
SIMMONS Sadie Church Street, West Wyalong Domestic duties
Jenn having a quick look through the indexes I cannot see a birth registration for a Sadie E HAIR in Aus.
The RETURN THANKS notice by Charles describes him as
Charles SIMMONS of West Wyalong and thanks the staff of a hospital for the care of his late wife. I appears to me she was in Sydney for medical treatment unavailable in the bush. I have checked the West Wyalong cemetery but no Charles is buried there.
There is no MI for Sadie E SIMMONS at Rookwood.
Did you try and trace the Sarah Ann HAIR who married Wm MUIR?
Cheers

Cando