If you aren't religious, or are agnostic.... I don't want this to offend. Skip if you want to....
Do you two go to church? IF you go (or used to go) to church, (and I only say this because she's sane and not a MLC/WW).... I'd try this: I'd ask her if she would pray with you. Get somewhere quiet, take her by both hands..... and lead the prayer. Don't be shy, and what is in there you tell God. She will hear and maybe reciprocate for the second half. Now, this is important. IF she agrees to this, you have to do it every night. Every night. No exceptions. She won't believe at first, she has to see this is real. God will do the rest. You are soooo lucky to still have a sane wife. So lucky. Now, if you two don't go to church, and aren't religious. Then the other part below applies.
Here's the other part, you have to pray for your wife, everyday. Multiple times a day. I would ask God to soften her heart so she may forgive you. There's a good book, it's called "The Power of a Praying Husband" by Stormie Omartian. That is a good place to start. Actually you may need to do this first before praying with her because you need to get close to God first. God does and will lead you if you ask him.... let God lead you, and as the man of the house, you lead her in prayer.
I can tell you 100% without a doubt, doing this is changing me for the better, I believe it is helping my MLC'er (although she still has to go thru the process, this isn't a cure) and I'm going to be a better man/husband for doing it. It is life changing. The commitment must be permanent and total. Realize too, that if you do this, you will probably be called to attend church. When this happens..... go. Go and go and go. Ask her to join you. God does miracles for those who humble themselves before him.
I sooooo wish I could do this with my MCL'er, but she's rebelling. No interest. Doesn't matter, her rebellion can't stop me from praying, and it can't stop God from doing his work in her.
You can DB like crazy and pray in secret (like crazy) for your W. That is a one-two punch.