I agree with sunny, it IS confusing. Just knowing what you posted, I would have been scratching my head too, but like you I probably wouldn't have said anything at the time. These things always tend to bug me later, when T isn't readily available to help clear it up.

I think it sounds like she thinks you already talked about the dreams. Either she is mistaken or you forgot (do you dissociate in session sometimes? I do). I think, either way, it'd be appropriate for you to talk to her about it. If you find that she did give you her thoughts and you just don't remember it, that in itself will give you both some useful information.

All that to say, I don't think you're overreacting at all and I would likely be spiraling out about it too in your shoes.