you dont know her
and when i have called the cops shes flirted her way out of it
What you have to do is very simple:
1. Record a few of her calls (According to the way you put it there must be some death / bodily harm threats in there and some pretty bad language) and count them, also, you should contact the phone company to show how many times she called you. You cant "charisma" your way out of solid evidence.
2. Go see lawyer / Police with said evidence, say (with good reason) that she is stalking you and threatening you.
3. Get restraining order.
4. If she doesn't follow the restraining order, she'll get into legal trouble (remember to record evidence if she does).
No one is above the Law, the Law is there to protect you from stalkers such as these, BUT evidence is key!
Good luck!