First of all it's always easy to throw on advices how to play when you're not playing on the field. Advice is cheap but payback is hell. Just think it about this way : whatever I, for example, say it really does not matter.
If I say no, what about then? You do as I say and then after five years you suddenly meet her with husband and kids and see how happy she is. She looks at you, smiles sadly to you and you KNOW : she was changed and that happy man at her side - IT COULD HAVE BEEN YOU. At this precise moment you curse me and my advices and curse yourself for being stupid as you believed what I said. You loved her once and you could have achieved everything that you wanted back then years ago. Bitterness, jealousy, rage and sadness? Pretty much yes if you were not at same situation yourself : with wife you love most in the world, maybe couple of adorable little kids with you. It's very probable that anything of this will never happen. Still, because I don't want nobody cursing me and my advices it would not be wise to say NO because it still might happen even if it's very remote possibility.
If I say yes, what about then? You meet her and seems to be changed. You feel sorry for her and you decide to be friends. Everything is fine and your emotions keep getting warmer. You end up being with her. Some time, even years go by. Then one day you learn that she has deceived you once more. Nothing has changed and she hurts you more than ever. She absolutely rips your heart to pieces and leaves you as a broken man behind. Bitterness, disappointment, rage and sadness? Yes, if she has not really changed and this scenario becomes true which is, again, very improbable. Still, you might end up cursing me and my advices so it would not be wise to say YES.
First of all, I don't know her. I don't know what she's alike. I don't know about YOUR dreams, fears and how strong you are. I don't know what you're cabable of. I can say what I've learned about myself, thou. Decision is up to you.
I sit here now with this question in my head, should i go and meet up with her? Is this all she wants? or could she try again for me? And whats more, would i be stupid enough to let her pull me in again, or is it worth trying again. The only reason i stuck with her was because i loved her so much. I believed i could change her ways if i just stuck with her, stayed faithful and by her side, helping her with whatever, whenever. But it never worked then, if she really is changed, like i always wished she'd become, is it worth another try? or should i just keep moving on, and not open this door again?
I ask your forum opinions. And karma is optional in this situation. To me, but to you all, i shall happily applaud for your useful feedback. Gravehill? *cough* 
Meeting someone is not a bad thing if that certain someone does not have a loaded gun with him. Does she have loaded gun? She does know your weaknesses and you have still feelings toward her. This were easier question for you to answer (you would not be asking them here anyway) if you did not have them. You know your feelings. Now weight them. Measure them up and do not ask what's that she really wants but ask WHAT DO YOU WANT. Do you want to see her? Do you even want to chat with her even when you have your doubts? What it tells that you have doubts even when she asks you merely to chat over coffee? Is it because you've learned about her that much or is it your own insecurity? What's best possibility that might happen? Worst? What if nothing happens? If you're happy for this situation now why to change it? Do you hope that you might end up being friends? More? Do you even want to be friends with her after what she did? Do you want her or want her to want you? If so, why ask other questions?
Foreseeing future is hard thing to do. Only way to do it is by reading history.
If tiger would come to sheep and say that she's changed would sheep believe her? Would they pasture together and eat grass? Tiger is hunter. It's her instinct. Sure, you love stripes. But there still are zebras and they eat grass too. Sheep cannot chance tiger. Sheep cannot chance anything. With zebras, sheep does not have to. Can tigers be tamed? Yes they can be. But it's still tiger. And you know how cats are. Even when you get along them well you will get cuts. How much scars she gave you hurted? Can you take it another time? Do you WANT to take it another time? Some of us do want to be dominated, hurted, even abused. Some have even pleasure of it. Others, they just feel that they've been castrated. What's your desire? Is it realistic? Can you achieve it? Do you even want to achieve it even if you could?
People can't chance. Their soul will stay same. Their actions may chance but the inside stays the same. It's same as with alcoholics. Even when they don't drink they are still alcoholics. They don't harm anyone, not even themselves anymore but if they drink even sip of alcohol it could mean that old days are back again. Change prevails until one gives permission to oneself to get back to old patterns, even once. It's same as with cheating. None cheats until they give permission for themselves to cheat. Not fighting against temptation, when it occurs, is permission to cheat. People give up. You know her past. Even if she's changed it might reverse some day. Can you trust her? Do you have faith in her? If you don't trust or don't believe that she is changed it's only hope left that you have.
If you play cards, do you want to put everything on one card that you hope to be winning card? I have done so sometimes and won. Sometimes I've lost. When I did have card that I have faith in I have won more often. When I did trust that my card will win I've won most. Just measure the risk and decide your bet. In love one does tend to put everything to game. Their soul, their heart, everything. That's why it hurts so much when it fails. Are you risk-taker?
I've not been on same situation where you are now. You can go, have nice chat and everything goes fine. Another chapter in life ends well. Or then not. Anyway it ends up it's your decision. You have accepted her apologies and you are not indebted to her anyway. As far as it goes this chapter might end as well here. It's still happy ending if you're asking me. What more could you both get by meeting? What could you get? Is it worth it?
Sorry. I keep asking questions instead of answers. I hope that they can help you to figure out what you want to do. Which way you ever choose to do, good luck with your decision. I hope that it goes best way possible.