I think that she is always trying to prevent progress in your relationship. Most likely she does this becuase their are demons in her head that she might have to face. So she trys to reign you in. She wants you to stop telling the counselor "everything" so that your sessions don't get any closer to the demons that she wants to keep buried. She is starting to feel REAL uncomfortable. This is her problem, not yours.
I say tell the counsoler anything that you might find relevant. How can couselling possibly help if you don't give them the whole truth, no matter how hard it maybe to hear?