Vent away, that does suck! She sounds like a devil.
I am so sorry you are dealing with this. It sounds like you are nearing an end with the whole lawsuit? This will not last forever. Even though it feels like it right this second, it won't.
Just remember, you don't deserve any sort of abuse, physical or verbal. You don't have to listen to it at all.
I know that advocating for yourself and your children is so hard. It wears you out emotionally, physically, and monetarily. However, it will come to an end in time.
Sending you huge hugs.