Choc .... Nopkins is right, all cheaters lie. I think the decision to take a stand, expose to her family, make her move, are perfectly understandable. She needs to really, really, really see what she is losing.
However. You were willing to give her a chance, before. You're angry now. Again, totally understandable. But her brain is in a mess. Just like you wouldn't hold someone who is mentally impaired as responsible for a crime as someone totally clear-headed, her lies right now are not her being sane. Make her live with her parents. Pay for her stuff. And then see what happens if her brain clears, and she is actually able to make some choices.
Decisions made in the throes of any wild feelings .... hurt, anger, lust .... usually don't last.
I think you're a really good man, Choc, and I've been amazed at your growth in such a short time. Whatever happens, you'll be proud of the man you see in the mirror. I wish you all the best.