"... I agree totally with your decision, it's not what I wanted but I don't want trap anyone into staying with me if that's not where you want to be. Let me know what I can do to help this move along smoothly"
And that's it.
In the end, you could never convince her to stay if she really wants to go, free will, you have to let her do what she wants to do even if that means divorcing you.
