You know your STBXW better than any of us. Ultimately, you need to decide what's best for you.
From an outside POV, it's probably a test to see if she can still lure you. Turn her down and see if she pursues. If she wants to be with you, she will find a way.
You are in a posistion of "high ground"; you have nothing to lose and everything to gain. Everything you have done and gone through is ultimately because of her bad behavior and issues. Don't respond to this test. If she is changing there will be more and different opportunities.
