You may already have what appears to be her funeral notice in TROVE:
https://trove.nla.gov.au/newspaper/article/28135653SCHWENN.-The Friends ot Mr. CARL SCHWENN are kindly invited to attend the Funeral of his late beloved WIFE, Susannah Rose, which will leave her late residence. 4 York-place, off Wise-street, Rozelle, Balmain, THIS AFTERNOON, at 2 o'clock, for Church of England Cemetery, Field of Mars.
WOOD and COMPANY, Funeral Directors.and a Return Thanks notice
https://trove.nla.gov.au/newspaper/article/15259900RETURN THANKS.
CARL SCHWENN and FAMILY, of No. 8 York-buildings, off Wise-street, Rozelle, return their heartfelt
THANKS to all kind friends and neighbours for letters, telegrams, and expressions of sympathy, also
to Mr. T. Murcer, the Missionary, and the Nurse who attended to her at home.There are some In memoriam Notices for her in 1912, 1913, 1915, 1917 (I may have missed some!)
AlsoCarl's death and funeral notices in 1923.
There are some In Memoriam notices for Carl up to 1927 which also mention Susannah.
TROVE has quite a few articles with regard to Carl's bankruptcies/insolvencies in 1889 and in 1870.
I am not seeing the son's entry the Vernon information on Ancestry but I can't seem to get it to load properly
Judith