I agree with the above. She is very likely wanting reassurance and is just going about it in the wrong way, although it is quite extreme. If she sees a counselor or therapist for the PTSD, perhaps these "symptoms" could be mentioned. Maybe it is due to an underlying problem outside of the PTSD. It certainly wouldn't hurt to let the counselor at least know. It may help them treat her as well.

Also, I was thinking maybe her self esteem is just so low (seems to be a common issue with PTSD) that she takes something you might say in the most negative way possible. I often get my feelings hurt when I take something my husband has said in the worst possible light instead of just asking what he actually meant or telling him what I heard him say.

My husband has PTSD and forgets things ALOT or sometimes remembers things, but gets the details all mixed up. He is always SO sure of what he remembers that it can start an argument if I don't handle it the right way.

One thing I'm pretty sure of, I'll bet the hugs and reassurance mentioned above will work wonders!