The Electoral Roll I had seen but there is no way of knowing if that is her. Her Mum was still alive then at the same address and I would have thought she would have contacted her if she were back in Sydney in 1980.
The NAA dossier is intriguing. It could be her. Her older brothers and sisters actively campaigned for workers' rights and were also associated with the Communist Party. Might be worth a closer look.
I'm very interested in the RSVP ad. in 1995. It would definitely refer to her. Definitely worth following up.
Not sure about the Funeral Notice. No age. And the marriage in 1923 she would have been 8. Her maiden name was Crowe before she changed to Muller.
Thank you so much for the help.