At the risk of being excoriated for saying this...
Have you considered that maybe this is the only honest answer she can give? She has no firsthand knowledge of these abuse experiences, either from their point of view or yours. As a person who would otherwise be a stranger to you, she can only take your word for it. She can't really KNOW. Just as I can't, even though for what it's worth, I believe you.
Dan, I don't know you at all. I certainly do not wish you any ill will, or prolonging of your suffering. I don't know anything about your history, and indeed, if you did go through years of abuse, I would not excuse their behavior. All I can say is that a big take-away from my own therapy has been learning how to identify and eliminate cognitive distortions. There are many of them, and they are very tricky and subtle. Mind-reading is big on the list, and so easy to fall prey to. The majority of anxiety and depression I used to feel was rooted in the insecurity that festered in my own cognitive distortions.
Congratulations on working on yourself through this difficult subject. Certainly you have the right (and perhaps obligation) to yourself to change therapists if you feel you've hit a dead end. I just wanted to submit this as food for thought.