Wow. Big changes. Did you get to ask her what prompted her changed perspective or wanting to heal the rift? Is she actively in therapy and working on skills and emotion management? If so, for how long?
Apparent competence can kick in for short bursts of time. Can she keep consistent with managing her emotions and moods over a long period of time?
What would you gain by re-entering the relationship? What would you potentially be giving up? What work have you done for yourself to heal?
All valid questions for both of you. If this ever happened to me I would have to ask, in a way that couldn't be interpreted as demanding (which would be very hard), the following questions.
1. What have you been doing in terms of therapy?
2. What have you found out from therapy?
3. Where do you think we went wrong?
4. What could you do differently when those things go wrong?
5. What could I do differently when those things go wrong?
6. Have you made any changes to better manage when things have been going wrong in your life?
7. Have you learned how to communicate your feelings and anger? (I wouldn't say this one of course but just a kinda joke).
Yes, feelings are facts for someone with traits. So the feeling might be a longing which is the fact of wanting to be together. A part of me fears that she will go back to normal life and forget all about the longing, etc. which will leave you in a hurt spot again.