Her name appears as Byrd Elizabeth in all records I can see.
Byrd Elizabeth Walters appears to be living in QLD 1963-1968 perhaps even earlier, then in NSW 1977-1985.
Are you sure that 1975 death of Russell James Walters is the correct one?
The obit you requested shows that it's not her husband.
Looking at QLD records she is married to Russell Hepburn Walters.