I agree with Ojap above - glad he put it in workable steps and strategy to take some of the emotion out of it. My only question is do you think she would be embarrassed and enraged if you contacted a person she worked with to discuss with her? I'd think that through really carefully. Would definitely only consider as last resort and be aware it could "poke the bear".
I completely understand your anger and sadness about S13. Every time my boys meltdown about D, I run to my H and beg/pursue for reconciliation. It's so difficult to see them hurting. The only reason I share this is to reinforce what Cadet said - we can only control us and our emotions. Your WW cannot think clearly right now. So, unfortunately, you have to be the bigger person here and not let your emotions get the best of you.
Keep doing what you are doing - not rushing into things, talking it through with your L, finding professional help, asking for advice here. You are doing the best you can under horrible circumstances. You are being very strong. Keep it up. S13 is lucky to have you.
M 44 H 46 M 20yrs T 25 yrs S15 S12
ILYBINILWY 7/18/15 Move to MBR 9/8/15 Physical Separation 10/10/15 Suspect A 8/2015 Confirm A 12/27/15 D filed by H 2/2/16