All I can say is WOW! This is way too eerie for me. I think my W has some repressed issues from her childhood as well or this could be some PTS from a sexual assault from her early college years. However, I think it is more of a childhod issue b/c when we were doing well, she was uncovering her feelings of abandonment due to her chronic illnesses in the hospital and her mother's post-partum depression. She also mentioned something about her father not letting her sit on his lap anymore once she hit puberty and said "maybe it was because he liked it."
She dropped the subject there and stopped looking into it. This is when she returned to the OM and began her "reign of fear" campaign against me. It sounds so similar to your sitch that I can't think the digging and her filing for a divorce are isolated incidents.
However, I'm like you b/c there isn't a thing I can do about it. W will have to want to do it on her own, plain and simple. I may have to express my "concerns" for her mental and emotional well-being in our parenting evaluations, but that is down the road a bit yet.
It is so very odd and strange. I know my W is FREAKED about the parenting evaluation and having to air our "dirty laundry" and I'm pretty sure it is b/c once we get into this process, she'll have to admit she doesn't have solid arguments against me any more.
Hang tough, my friend. I've made a point to mention "my friend who is having legal and custody issues" as an intention during the prayers we say at the start of each class. You're in my thoughts and prayers.
Keep pushing forward and compiling everything you need for Thursday. I'm sorry you are in this place. I really am. However, you are doing the right thing for your children and you will come out on top.