Most Helpful Girl
Why do you want her back?
From what you've said, she's told you why she wants to meet up - she thinks she's made a mistake about breaking up and wants to discuss your relationship, whether this means getting back together or just talking things over and understanding for her I don't know, maybe she just wants you in her life as a friend, you won't know until you talk to her.
You say you want her back, but it doesn't seem like she treated you that well, why did she end things and why do you want her back?
If I were you, I would arrange to meet her, somewhere non-commital like for coffee, in public, during the day and talk things over civilised but don't go in with the expectation that you most definitely will get back together, just go in and hear what she has to say, if she says she wants you back, tell her you need to think things through a little more and take your time and really figure out what you want then decide.
Hope this helps :)