Yes, I know what you are talking about and it is an interesting part of the therapy. I know for me, if I were a therapist, I would be emotionally whiplashed if I let myself be emotionally connected the whole time. If I were to feel every feeling with 6 or 7 different people each day, I would emotionally drown, and probably be non-functional. The clinical detachment is important. It provides a perspective that will ultimately be more helpful to you (hopefully) than if one were mired in the emotional responses. I get that it does not feel as good. When you are telling all the soul-wrenching details of your past, you want a t to react in an emotional way to what you are saying. You want it to affect the t and move them because it has sure affected you all these years. But if the t gets in on the emotional boat with you, who will stay grounded and be able to pull the boat back to shore? You need to know t is there holding you and because of this, you are safe. You can go there. You can do what it is you need to do. T holds the space.
That said, it sounds like your t is distracted by her personal life, looking at the clock and such, which would probably irk me too. If t can't be present at their job then maybe they need some time off so they are not taking from the experiences of clients. Sorry she seems so rehearsed and "trained". How long has she been your t? And how long has she been a t?
I've definitely caught my t looking at the clock. Well, me being who I am actually, I'm so damn sensitive about it, hell I check the clock throughout session just to make sure I don't go over or get into anything too heavy or deep too late in the session. But yeah, it has bothered me when she was late and then cut the session early... Stuff like that. I don't feel like I'm getting practiced facial expressions though. They seem real, they just don't go too far into any unpredictable realm. T will smile, or looked concerned. I don't get into anything too deep though. I'm probably afraid to partly for the reasons you are describing. It is really difficult to trust another person with the deepest corners of our wounded souls.