Look man, you CANNOT lead her through this. As much as you want to, you can't.
This time is about YOU.
Also thinkin that telling her therapist anything is not such a grand idea. IF she is any kind of therapist, she has seen this before. And until your wife is ready, and open to changing and healing, she will not be forthcoming in any areas.
A MLC'er will walk a mile to lie instead of standing still and telling the truth.
This time, and HER crisis, can be a positive thing for all involved, you just gotta step back and let it happen. Be true to yourself and instill the things that you need to do to be a better person.
IF you went back through the Archives, and found posts from any of these wonderful people posting to you now.....you would find their first posts quite similar to yours.
Pick ANY one of them out of this thread and ask them if they are truly thankful for their journey through this....