Either she has a lot of dead skin or she is not that much ticklish.
http://www.you tube.com/watch?v=UY8faKdLcrw
remove the space.
http://www.you tube.com/watch?v=UY8faKdLcrw
remove the space.
I know the clip you are talking about, but it's not that convincing. Even if she said that it tickled making some modulated HA HA HA for the audiance, there is no better prove that she is not ticklish than seeing her being treated with a brush like this. Many people with only moderatly ticklish feet couldn't handle such a treatment without struggling, she showed no reation at all!