I think that we naturally "mirror" those who we are close to, or those who we are talking to or sharing with. I think this is mostly unconscious. I know that my voice and body language change when I am, say, talking to a friend who has been going through a rough time, or celebrating something joyful with a friend. So I wonder how much on the T's part is intentional and how much is unconscious. I think my "mirrors" slightly and that it is unconscious. I think if she was spending so much time mirroring me then she wouldn't have the energy or focus to talk to me in the way that makes her the excellent T that she is.