Hi Cativolo and welcome to the group

The stress of when your child's other parent withholds contact is beyond description. It makes a lot of sense that intellectually, you can say "I know I should be learning about how the courts work", yet the overwhelm makes it so difficult to function. How have you been doing the last few weeks?
It can be a long process coming to understand the "why's" of BPD behavior. One short answer is that many pwBPD (persons with BPD) experience their own feelings as facts/truth about the world, instead of the other way around. If in one moment she "felt" like you had hurt her, then that became an eternal fact in her mind, and she may have felt justified in that moment to do hurtful things back. It isn't necessarily about anything you actually did or didn't do.
I'm so glad to hear that your mother is supportive. When my H and I were coping with hurtful things coming from his kids' mom (who has many BPD traits), support from our parents was so important and kept us going.
Where are you at with the continuations? Do you have a lawyer/solicitor/representation?
We'll be here for you;
kells76