Seems pretty clear that she doesn't want you back. She's just feeling guilty and is answering to her conscience. That's her problem.
As for you, this is definitely opening a can of worms. I hope you have a way to contain the worms. Contacting her can easily rebuild your false hope if you still have feelings for her. The result would be resetting much of the progress you've made over the past 5 months. Are you prepared for that?