I am sorry you find yourself in this situation. Some of this sounds familiar to me. (firm on decision to D, we were looking at rings the weekend before the bomb, the kid(s) will be just fine, etc.)
She is not thinking rationally right now. She is likely feeling a lot of emotions she is not showing you right now. She sees D as the only solution to her problem.
It sounds like you should be doing the LRT. Cut out any pursuing, I love yous, etc. and work on the GAL.
I would think if she goes through with the D, you should be entitled to some kind of support.