I have and sometimes still do dissociate when talking with my therapist and other treatment providers... to understand this you need to understand what dissociation is here where I live...

here where i live dissociation is the normal reaction (feeling numb, spaced out, disconnected...) to anything triggering (anything that causes me to feel uncomfortable or upset)

example when ever my treatment provider and I talk about hurricane sandy (a triggering time and event in my life) I start to feel numb, emotionless, spaced out, like I am sinking. I feel no connection to my body nor anything in the room. the technical term for this is depersonalization/ derealization symptoms (in other words dissociation symptoms and dissociative problems here where I am.)

my suggestion is check with your treatment provider on what dissociation means where you are (many locations have different definitions of what is dissociation) it may be that your treatment providers definition of dissociation is different than your's so she may not be considering how and what happens to you as dissociation.

another suggestion.... when you notice you are dissociating maybe you can let your treatment provider know its happening.