The DR book tells us to wait 72 hrs before we act on a decision like that. I don't think you should plan that for tonight. You need more time to think and feel sure about it. You need to think of possible answers that she might throw out there and how you will respond. You don't need to set yourself up to be shot down by something unexpected from her. So......take time to be solid if & when you approach her.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!