Wot Sweetpea wrote ^^^
Your wife has shared the info with you.
Be extremely careful what lenses/ filters you view this information through, as the assumptions can easily become irrefutable self fulfilling prophecy.
Eg, "she's got PTSD, she can't help it" suggests to you that she cannot change
It also suggests to her that there's no reason to try to change because she can't...
IMO non of those three are true.
There are some chapters which you and your wife might find helpful, and could form the basis for you sitting down and having some honest and open conversations with each other
Raymond Bergner | Illinois State University - Academia.edu
Start with "impulsive action" and see how you get on.
If you like that, try "paranoid style"
Then the other two, hysterical and overseer.
I'm not suggesting that your wife fits any of those pigeonholes, she probably doesn't, but I think that you'll find the chapters make the behaviours much more understandable for you.
And they'll also help you to understand how your wife must be feeling at the moment.
Edited
Couples therapy is a really good idea. Good luck