The best thing for you to do is act as if you have accepted her decision and you are moving on without her. But here is the key point in doing so.....you must act as if you are are not carrying a touch for her. That's hard for a LBH, b/c he wants to say & do the things he should have been doing all this time. You have to act as if you will be happy with your life with or without her in it. Speaking as a former WAW, I believe it will get her attention if she thinks you no longer want her. You do not accomplish this by saying anything particularly, or doing anything except pulling completely back from her.
By showing that you are not interested in her for a wife, that means you are not angry, jealous, rude, or selfish. Hopefully, that which makes her female, will rise to the occasion.
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!