Wayne,

When Cookie does this, is she in a playful mood? Is she normally a talker outside of this? If you play with her for a while (read: tire her out) does she stop?

Noel, our tortie does the same thing. Last night she was very, very vocal. When I played with her, she stopped. When Noel does this, it seems like she just wants attention and to play.
But, like I said, she does stop after a while. Does Cookie?