IMO she has zero intention on working on the marriage. Look at her actions. She won't put the D on hold because it takes a long time WTF??? Way to have a positive attitude. She's still in the affair. WW in affairs want a quick divorce.
If you want to show strength you stick to your boundary. If you cave now that shows weakness. I don't care if you have MWD herself you can not improve a m when your w is in an affair. You will just give her an excuse to say " see we tried everything and I just don't want to be married anymore".
I'm quite sure you will go and regret it like so many here have who have walked in your shoes but I feel a duty to give you my opinion on it. If you want a recent example of MC being a complete waste of time read "uchen's" thread.