MelbourneBen
Member
I would go down to BDM and formally change her name. Your wife will then be issued a new birth certificate, with her new name, and previous names on the back. It's - literally - ten minutes in and out of the office. You don't get a name change certificiate at BDM Victoria unless you were born interstate / overseas. For Victorian births, they will just re-issue the certificate.
If you haven't already done so, make sure her DS260 has all known names including her maiden name. That way, it will all match up to her birth certificate
DM me if you need @MelbourneBen. I have some other info that you might find helpful, but I don't want to post it in public!
Thanks! I'll send you a message now.