First things first..."Sage" is a childhood nickname NOT an indication of my level of wisdom -- trust me on this!
So...your question is about whether or not to confront your w, right? NOT about whether or not you should continue snooping??? (see my first post to you a few pages back for my advice in that regard).
Just my 2 cents, I wouldn't confront her. You guys are having positive interactions, are quite possibly rebuilding some good memories upon which to rebuild your marital bonds. If you tell her that you know she's still in contact with om, that you've been snooping, that you know she's recently lied to you, etc, well, I think that will pull the rug out from under the progress that you've made.
Here's my add-on suggestion. Stop snooping. I think it will eventually undermine the progress that YOU think you've made...not just w. It's hard enough to DB without the added anxiety/suspicion/etc of checking up on your w.
I know that you don't necessarily feel comfortable doing that...could you try to implement it for a week? 2 weeks?
I'm glad to read of the good times that you and w. have shared of late....
Sage
Relax. Appreciate. Be calm. Laugh. Enjoy. Be secure. Be loving. Be loved. Don't personalize. Don't ASSume. Accept. Be grateful.