I don't think you can tag this one unconscionable act to a specific mental illness. It could be a lot of things, including greed.
I'm trying to co-parent with the mother of my child who I believe has borderline personality disorder. I would like to describe some of her traits/actions which I believe why she may has BPD. My intention is not to have her diagnosed/bashed online but to shed light and lead me in the right direction to co parenting skills in case she does have BPD.
Have you looked at the tools in the top menu bar. That's a place to start.
What has been going on since the pregnancy and the breakup. What is you relationship with her like. Is she involved with someone - is he interfacing with you?