I sometimes think what you remember happening and what she remembers happening are not quite the same thing. You perceive events in your therapy often under a great deal of projection and stress related to how you interacted with your family, and it seems to skew your perception somewhat. So, what you may see as her not remembering what went on in the last session may be more about her not having experienced the discussion or session through that same emotional lense as you rather than her actually forgetting.

What you may need to do is say this is what I heard and experienced in our session last time. Is what I remember/experienced accurate or is what I am remembering a bit off because I was upset/angry/scared/dissociated (whatever goes in that blank)? Personally, I found that many times when I left a session really upset in some way, how I remembered things emotionally and how my T recalled things objectively were very different perceptions of the same events. Neither is necessarily "wrong", but a T isn't inside our bodies and minds and emotions; they are seeing things as an outside observer and making evaluations through their professional/therapeutic eye.

It's also true that sometimes what we focus in on as important to us (probably because it somehow triggered us) may not have been nearly as "important" or significant to the therapist, particularly if they are unaware that we were triggered by what they said in some way. That is why it is so important when we can to let them know in the moment what our reactions are to what they say. They may not at all be thinking what they think they are thinking or even meaning what we think they are meaning. Asking for clarification and communicating our responses to what is going on in the moment can mimimize undue stress that way.