She is very fortunate to have you, OP.
I would contact WA, or a local DA agency, yourself, and they will talk you through her options.
I fled the house with my child on a rare moment that my abuser went out. I had to take everything I could - including all vital paperwork. Anything that I left behind was lost to me. It sounds silly, but think about some of the sentimental things that she might not want to lose forever, "Things" can be replaced, but things like baby's first outfit can't.
I had spoken to my bank manager, in confidence, prior to leaving, and had a new account ready and waiting. All documentation was delivered to the bank, not my home. My mum transferred some funds into it the day after I fled. It mattered when applying for rental properties - "ho long have you been with your current bank?" came up as a question.
My sibling stood as my guarantor on my rental property. It meant I could rent.
I had a couple of weeks at a friend's house before finding a rental, as they were away on holiday and things got a bit urgent, meaning I had to leave there and then.
Is it easy to communicate with her? Does he have a mobile? Can you buy her a new SIM? I used to be able to go the library to use the computers, but I know this isn't an option in these times.
I know people will say get her out now, but if it takes a little longer to get her out safely that's OK, too. It was 16 months from me first reaching out for help until the day I finally got away. I am not recommending that, but a few extra weeks might make things safer in the long term.