I know you want this to work out and I hope it does for you and sooner rather than later.
You may be right in your therory and if you are she is in desperate need on therapy, CBT would be great for her. If she won't accept her issues as her porblem and seek help nothing will change and she will move out as she plans.
Now please don't take this wrong, but your talking to a lady with a bit of experience and you wrote "She has no deeper relationship with anyone but me" Are you truly a believer that couples tell each other every single thought they have and talk to each other about every move they make.
I sure know I think a lot of things that I would never tell my husband as well as I have done things that were dumb but I have never told anyone and I won't not even a therapist. Some things are my private business.
That is why I asked if there was someone else. You maybe the person she has the deepest relationship you know of but her relationship with herself is a private one. Does that make sense?
Just my opinion and not going to make a lot of difference but it could keep you from being blown to bits by any surprises she may have kept from you.
Gentle Hugs and take care.
Moderator Anxiety ~ Panic Disorders
*~* Not a mental health professional at all *~*
Dx: Anxiety/Panic, Depression
"If you doubt you can accomplish something, then you can’t accomplish it. You have to have confidence in your ability, and then be tough enough to follow through.”