Not that it will slow her down, but have you asked her what is the problem? I don't think she will be honest, but it seems only right that you should be given a reason for why she wants out.
Whatever she gives as her excuse, don't argue with her.
You may feel panic right now. There is life after D. You will make it. Does your family live near to you?
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!