just take your time and decide on a firm plan of action before revealing anything to her. You want to cover your bases here. I like what LITB said except I would make it briefer and exclude the part about choosing to work on the MR. She already knows that part. It'd be better if she thought otherwise.
She should she go live with the OM and see how great it is. Just make sure that you aren't getting in the way of her seeing how much of a POS the OM is.
You need to make it real, for you and for her, that you aren't going to be sharing details of your lives and playing all hunky dory with her and that you aren't going to worry about her anymore.
She just wants the classic "cake-eating". Make sure you aren't running a bakery...
H 34 W 29 BD 3/12/18 Divorce Busted Spring 19
It is not things that bother us, but the stories we tell ourselves about things.