Sarah married Thomas Trevithick "Junior" (1957 Mt Ararat VIC - 1929 Newtown NSW), son of Thomas Trevithick "senior" who was involved in gold mining at Hill End.
I hope this death certificate is useful ; the maiden name "Lee" may be mis-transcribed, or mis-remembered (it should be TEE). Sarah's father was a convict, and no-one has been able to ascertain how her mother came to Australia. The informant, George Fever, was not actually married to Millie in 1945 (they married in 1952), and the list of Sarah's children is only very partial.
New South Wales Death Certificate
Date and place of death: 1945 11th June, 14 Regent Street, Municipality of Newtown
Name and occupation: Sarah Trevithick
Sex and age: Female 88 years
Cause of death, Duration, Medical attendant, When last saw deceased: Chronic myocarditis, 4 months, J.F. Burfitt (Registered), 4th June 1945
Name and occupation of father: William Lee
Informant: G.E. Beaver, Son-in-law, 14 Regent St, Newtown
Registered: 12 June, 1945
When and where buried, name of undertaker: 1945 12th June, Church of England Cemetery Rookwood, H.G. Smith employed by W.N. Bull Pty Ltd
Name and religion of minister: R.O. Todd, Church of England
Witnesses: E. Newman, K. Pochee
When are where born how long in Australian colonies or states: Hill End, NSW
Place of marriage, age, and to whom: Hill End, NSW, 20 years, Thomas Trevithick, Widow
Children of marriage: Thomas W 66, Henry 62, Millie E 56, Frederick C 47 living, none deceased.