Kml is right, your XW is just being an @sshole. There's nothing you can do to fix her @sshole issue, but you can do just a bit of documentation yourself.
Create an email message that explains what's happening regarding your XW's phone calls and propose some solutions to the issue. Maybe she'll respond positively, or maybe not (probably not). Regardless, you'll have your own documentation that you were proactive in trying to resolve the issue. If your wife decides to do some legal maneuvering, then you'll be able to show that you've tried to address the issue.
