Okay our sitch's are similar in some ways. Your W was not ready to move. Moving countries was too big a step for her. As someone who has lived in an 'international' couple for 15 years, in my 20s and 30s, I know how stressful it can be to leave "home". You weren't to know how scared she might be of course because you made the decision together to move to Aus! (Same as me and WH).
I know you don't want to think down these paths, and it is pursuing in DB terms, but what would happen if you went back there? Do you have a life outside W? Would you want to live there again, with or w/out W? Do you still have a visa or can you renew it?