Hurt, I know it would be easier if there was a simple fix (such as a medical condition that gets treated and goes away), but that's unlikely. And if that happens you can deal with that then.
Instead I'd recommend dealing with the here and now, the reality. Regardless of motive, she is acting in ways that you must react to protect yourself. It's not her motive that's the issue, it's the behavior. And the motive doesn't change the behavior. So it really shouldn't change your response.
Bond said it best in his one sentence to the point way. Let her go on her journey, you just take care of you.
Me:38 XW:38 T:11 years M:8 years Kids: S14, D11, D7 BD/Move out day: 6/17/14, D final Dec 15