Do you have a copy of the registration of their marriage?
Agh, so it IS your Sarah in 1903

Also on that particular Roll with surname GIMBERT and at 79 Wilson St Newtown were Alice, Ruth and William. William was a contractor. The ladies were at their domestic duties.
Some further bits and pieces
NSW Police Gaz. 29 March 1916
Wife Desertion
James Preeo, 50 years of age, 6 ft tall, medium build, sallow complexion, dark hair and moustache, thin features, dressed in a navy-blue suit and soft-felt or straw boat hat; a tailer. Complainant : Sarah Preeo, 65 Wilson Street, NEWTOWN.
NSW ER 1913 NEWTOWN, polling at Wilson Street
PREEO, Sarah, 65 Wilson St, Newtown domestic duties NO OTHERS with that surname at that address.
1930 and later Electoral rolls ….
Sarah (no further given names) PREEO, 65 Wilson St Newtown …. Home duties
HOWEVER, just to confuse the issue:
1913 NSW ER HARTLEY, polling at Wallerawang
Sarah PREEO, Wallerawang, housekeeper. (no others with that surname there)
Cheers, JM