the house is still both in their names.
I'm going to assume then that here are NO formal property orders in place from the divorce (if there was, the joint title would have been dealt with at that time) .... In that case, anything she may have signed back then saying she no longer has right to the property, would be a worthless non binding, unenforceable piece of paper (Assuming as I say, that there are no formal orders or binding financial agreements in place)
is it considered defacto? can she live and get her own place.
2.yes they share everything.
If there were never any legally binding formal orders/agreements, then their current living arrangements (whether de facto or not) may not be as important regarding her rights to getting a fair & just division of assets .... She can leave & find her own place, OR, remain separated under one roof while she files for property settlement...
Only relevant factor that might come into play is the 12 month limit from divorce to file, BUT, the renewed living arrangements (which it seems *may* be regarded as de facto in spite of separate bedrooms) could well 'reset' the clock...
She should see a family law solicitor to go over her circumstances in detail, to advise on her rights to property & asset division