D- very sorry you're going through this. I know it must be tough, especially since it hasn't been that long since BD for you.
Also really sorry she took half your parents' money. That tells you what kind of person she is right there. Zero character. That should be enough to convince that this is for the best.
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What do I do? Do I contact XW and tell her I know it's finalised? Do I contact her parents - if so what would I say? Do I say anything to XW about how tragically sad this situation is?
No say absolutely nothing. Go dark. Don't talk to XW, you're divorced now. Don't reach out to her parents. Take time to heal.