When you aren't sure what to do....then do nothing at this time. Sit quietly and the answers will be revealed to you.
I have a question for you and I want you to sit on it and really mull it over before answering it. I want you to be as honest as you possible can. What do you want? I know you would like to have your original wife back, but that's not going to happen any time soon, so what would be next on your list of "things to do and want for your life".
Let me be perfectly clear here, she's going to move along the path and heal in her own time. You can't force the issue and you certainly don't want to rush it either. She is operating on "slow" and slow it will be. You do not want to rush her and she not be healed and come back and do this again. The next time around won't be easy, in fact it is usually far worse. So, if you are thinking that a divorce will help rush the process...it may not.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.