Bill, I'm sorry. I think that's the hardest part--getting the papers.
Good on the phone call. You want to be polite, businesslike, and brief. Treat her like the mailman someone here told me, and I think that's a good one.
Focus on being the best you and the best dad. You need to do more GALing now to keep your mind off everything. It really does help.
Meet with your L as soon as you can. That will help too.
This process takes a while. It's not over yet. I just spoke to a friend yesterday who had filed for D and then she realized she missed him, it was very $$$, and reality set in, she dropped it. They're now attending MC and she says she's happy. (Seemed a lot happier than when she was planning on D). Your W will be finding consequences too. Don't rescue her from them or try to help her with them.