I would not move out. She is the one that is having the problem and talking to her ex. If she wants to move out then I say that she should do it. Also I would not force her to go to MC if she does not want to. You cannot make her do anything, however you should go alone it really will help you more than her.
I would get DB and DR and read them. They have some really good advice to help you thru this.
Also I would move your thread to For Newcomers. You will get more people reading your sitch that way.