Why would she want to save it if she doesn't love you anymore?
Have you ever considered this?
Sometimes it really is that simple sometimes.
I dont understand what children have to do with anything? - if she isn't happy she isn't going to stay - no matter what house, home, kids or whatever you have.
You are wasting valuable energy here focusing on her saying (you look good) or you stating (i said and did all the right things) whatever - it means nothing - and she is quite clearly keeping you sweet while we plots her escape to her "new" life.