Her frontal cortex is dead, she's running on automatic pilot. Any of Terri's reactions are the same thing as a chicken running around with it's head cut off... something I've seen happen. Very disturbing... and one of those things that comes with living on a farm.

And I shall repeat myself: she DOESN'T EXIST. THERE IS NOTHING OF HER IN THE SHELL THAT WAS HER BODY. What more is there you need to know.