No I mean she will likely divorce you and realize years down the road she isn't happier. Typically in these situations things have to get worse before they get better. I'm being honest with you because I can see you are setting yourself up for a major disappointment. You see she finally is moving forward with what she has probably been planning for years and you have accepted it relatively well so she feels relieved. That's why the laughing and joking. However this typically makes the LBS think things are getting better so they eventually end up bringing up a relationship talk in which the WW quickly reminds them nothing has changed.
The quickest way back together is to go in the complete opposite direction. Wish her well and go out and live a kick a$$ life. The longer you hang on the longer and painful it will be for you. The hardest thing to to right now is to accept that she is done and there is absolutely nothing you can do to change her mind. Pursuit is the number one enemy of DB. Are you strong enough to let her go?