I know a couple that have been married for almost 20 years, and the wife continuously runs away, drives off into a random direction every 3-5 nights or so. Something happened to her over 30 years ago where some man assaulted her and kidnapped her, something along those lines, and it's gotten to her ever since. For some reason unknown to us, she wants a divorce with her husband. They have done counseling on and off. And all the husband can really do is just go after her each time she runs away, put her back in the car, drive home, and continue loving her. As hard as it is, when you have a family, all that matters is your family. You will do anything to keep that family intact, no matter how much she ticks you off, no matter how many times she yells at you or draws arguments with you.
The difference here with your story is, it does sound like your wife is trying. Divorce isn't even a word in some countries, can you imagine that? Can you think of the impact the loss of that word would have on our country? I know, we all hate to hear the words "I'm *trying*" but give her some more time. The more she opens up in her sessions, the more she will realize that you are still there for her. I know the light at the end of the tunnel is so far out of sight, but keep pushing forward! Don't push her, only support her. Give her a chance, like you've given millions of times before. Be merciful as God is merciful, if you believe in anything like that.