My guess is that she has a boyfriend and she's busy fantasizing that he wants to marry a woman with 4 kids. Chances are good he will run in the other direction when he figures out what she has in mind. Your best bet is to proceed toward divorce with the smallest settlement possible for her. When he sees the price tag on the free love he's been getting he may break up with her. It's only when he rejects her that you have a chance.
