Hello, there is a tree on Ancestry which has Ethel remarrying in 1927 to a Graham McNair and dying in Flemington, Victoria in June 1971.
I know that some of the information on ancestry trees is untrustworthy but it might be worth checking it out.
Jackie
Not the right person…
Deaths: 14997 / 1971
Family name: MCNAIR
Given name(s) Ethel Mary
Place of event: Flemington, Australia
Mother's name: Beatrice Mary EYRE
Father's Name: PONTIN Victor Haroldhttps://www.findagrave.com/memorial/199260704/ethel-mary-mcnairEthel Mary McNair
BIRTH: 1905DEATH: 24 Sep 1971 (aged 65–66)
BURIAL: Melbourne General Cemetery
Parkville, City of Melbourne, Victoria
PLOT: MGC-PRE-Comp-N-No-700
MEMORIAL ID: 199260704
Same plot:
https://www.findagrave.com/memorial/199260904/victor-harold-pontinhttps://www.findagrave.com/memorial/199260903/beatrice-mary-pontin