Some of it sounds like age appropriate behavior (coping with sensory overload in a crowded place), but it appears jarring because she's so advanced cognitively that you'd expect her coping mechanisms to be too.
The hypersensitivity to sound- that's my son. He used to cry everyday at pre-school because of the rousing goodbye song they sang. From what I've been told, it's about management and maturing systems. The sensory seeking too. DS is coping better as he gets older. He has CAPD but it's a different set of behaviors altogether.
My son rubs at his fingers almost constantly. I have a theory- he has a huge bandwidth for information, almost like he was made to absorb and to think things through. Hence the sharp hearing, heightened awareness. When there is idle time, his brain fills it in with sensory seeking activities. Not extreme or dangerous, but just a sign of idle capacity somewhere inside.
