I'm sorry that you had to and are having to go through that, but it sounds like you've made a great start on detaching and separating yourself from the situation.
My x did similar things when I ended the relationship (r/s). It's not uncommon for people with Borderline Personality Disorder (pwBPD) to act out in such ways as the struggle to maintain the attachment. Hopefully that has all calmed down a bit by now.
It may prove to be useful to learn about BPD and how it effects r/s.
THIS is a good place to start.
Have you had any contact with her today?