Being irritated by jokes about the druffalo she didn't want is all but admitting she wants the druffalo, so of course Teren doesn't react. Also, in the deep dark recesses of her shriveled heart, she finds 'cutesy bootsy' endearing.
Revolting.

"Most of the journeys we take are no place for a cat," she observes, "it's kinder to leave her here." Not that the cat can't fend for herself, but not all of them will be Pounce.