Okay, then just listen to her talk. Nod your head, if appropriate. Do not start repeating a bunch of stuff you've heard on the board. Just listen.
If she is basically saying the same old stuff, then don't try to change her mind or argue with her. If, by chance, she says something about going back together.......keep your cool! This is the time you look for any sign of remorse, an apology, take responsibility for her actions, make some kind of statement of her wanting to do whatever is necessary to get you back and save her M.
If she does not show any of these things, do not agree to take her back. If she still show a bad attitude, or still blames you for everything, or wants to move in together but stay in separate bedrooms..........shut it down right then. She is only seeking benefits/comforts of the M without taking any responsibility as a W.
Remember these words, in case you don't know how to respond to her proposals (if she should make any), "It's not that simple anymore".
In other words, you are not going to walk back into the same MR you left. There should be some things you require before entering into another R with her. Do you know what those would be? She may not ask what will it take to save the M, but you should still be ready with an answer.......just in case.
Remember, don't volunteer this information, unless she asks.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!