I liked the way the MC appointment went. Sounds like you got a good therapist. That's wonderful! Glad to hear she is thinking about moving back home.
As time goes by, and you both start feeling comfortable again in the relationship, it becomes easier to keep the good feelings going. You just have to keep remembering the difference between doing what works, and doing what doesn't work.
I experience moments almost every day when I am tempted to criticize something my husband does, but instead I keep my mouth shut and go about my business. And life goes on smoothly. If I let go and told him the thought that went through my mind, we'd be back in the same old bad feeling game. It's really not that hard to do the right thing. And it's a lot easier than correcting it later.
