Yes, I think that is a good plan. If she does not want a divorce she will have to show it soon. You are making a stand and dropping the rope, as they say around here. If she does change her mind, then you will have the opportunity to say that you will stop the divorce if she goes to Retrouvaille with you. I know that you have been saying that you wish she would do that. So you will see. If you are giving her what she wants with a divorce, then the divorce will happen and you will go on to have a happy life with someone else. If she decides she doesn't want a divorce, then you can insist on Retrouvaille and change in the marriage. Either way your life will improve.