It sounds like a very frustrating situation, free1. How about if you write down a short list of the questions you must have answers to before you leave her office next time and give it to her. Maybe even write down her answers in case you dissociate and forget. Perhaps your list would include "how should I cope when I dissociate?", "can you help me learn to cope?", "why do you ignore my flashbacks when I have them?", "do you have a strategy for helping me with these past traumatic events?" As you mentioned, maybe she does not have the training to deal with issues like yours. In that case, you could ask for a referral. Please do not think that the fault is yours and that you are not a good candidate for therapy. Hang in there and best of luck!

Added later: occasionally I dissociate in session, and when my T learned that, he watches for it now. He says he tries to retain a greater degree of connectedness with me when he sees signs it will happen and this helps me remain there with him.