Before part 2, while at work today, or take an hour after work, but I think it is really really really important that you put together your list of requirements for R to even be considered.
1. NC
2. Transparency
3. No rides alone with men. Must include you. (for now) eventually maybe could include females. But not yet
4. IC
5. Honesty, full accounting of any questions you need answered
6. Participation of family/kids activities (not just showing up).
7. Reading, journaling in an effort to fix M, herself, and be a good mother. (I am not sure she knows what this means).
8. Anything else I left off from the pages back around pg. 15 or ??
I know she is hitting rock bottom. The thing you have to remember, is that if you donm't let her be the one to start working on and changing things, and you start trying to "keep the family" together, be there for her, feel bad for her (which anyone would b/c you love her), etc... If you do any of this too soon, she will immediately start into the manipulation trap, b/c she has the last few years.
You said yourself that she isn't the same woman these last few years that she was before. You are in love with the woman before. SHe is going to need time and to do a lot of work ON HER OWN, to become the woman she can be, BUT, it won't be the same woman from 10 years ago (or whatever #). You have both changed, her too, and even if you get your wife back and she works and does everything she needs to do (only in a perfect world) she will not be the same person.
But, you have to have the conversation of what it will take to continue, to TRY to R, etc.... I know you miss her, feel bad for her and love her. If you do (and I know you do) you have to do this, so that she cant sabotage it (even unwittingly).
Kind of like a drug addict or alcoholic. They love their family and would never hurt them, knowingly. BUT, when they get to the point where they are withdrawing adn NEED it, they can't think straight, they will lie and manipulate.
Not that your wife is an addict, I am not saying that, but until she gets help thru IC, you can't let her get comfy in the house/marriage. B/C then she will manipulate and not do the work she needs to do. And trust me on this, if she gets to comfortable to soon, it is 10 times harder to address the issues and get her to do the work. (I caved too early the first time. I loved him and wanted to make it better. I wanted to believe we could just have what we used to have. You can't. That is over.) Grieve it, but know you can have a good marriage, but only if she gets help. Be strong on this.