I'm sure these are legitimate marital complaints, but why won't she agree to work on them with you now, together?
I think it's because she's opened herself up to someone else emotionally (and perhaps even physically), and she has therefore shut herself off to you. I didn't want to say anything ahead of your MC appt., so as not to discourage you ahead of time, but MCing rarelyworks when there's someone else in the picture.
All you can do right now is work on you, and establish any boundaries you want to establish. You can't force her to want to be with you, but you can certainly GAL and do the other DB things that will help YOU, anyway.