There's a really short answer to this one. You're better off without her! You've managed to escape, don't throw yourself back into her clutches. It's natural to be sad when a friendship ends but you are clearly not the guilty party here.
You obviously have the patience of a saint even to have put up with this girl. She didn't appreciate you then, and she's not going to now. She displayed qualities of a self involved narcissist, she didn't value your friendship and used you as an audience. You were probably a valuable sounding board and good for her ego.
If she hasn't tried to reach out to you since then, I'd say leave well enough alone and don't get back into a bad situation, she's not worth it.
Friendship is about give and take, not take, take, take!
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