Statue part?

About a month into my journey working with parts, I’ve been reading "No Bad Parts" and working with my student therapist. Initially, things were going quickly, and I could access my parts pretty easily. But I’ve come to a sort of block, and funny enough, I think it’s a part. In my last therapy session, I drew some of the current parts that I was feeling, and I drew one I called “Numb/Lost.” I figured out it was a firefighter that protects so much that it also blocks other fighters like anger. I went in to try and talk to her, and I swear to God, she is made of granite. She’s as stiff and solid as a Greek statue. Her eyes move around, but I can’t even get close enough to touch her. It feels like she refuses to hear me, or maybe she doesn’t care too, but I was just curious if others have experienced a part like this. If so, what do I do to get through to her? I’ve been trying to check in with her, and to let her know I’m here for her, but she still won’t have anything to do with me.