She watches him carry the kittens around with a somewhat disapproving expression, just waiting for him to put them down on her console so they can walk all over her controls and disturb her. They're not 'real', but they're certainly corporeal.

At his conclusion she looks up at him, tilting her head slightly in a mixture of confusion and interest. "Why?" As in, why does he think it's the Rift. She obviously has no experience being the good little companion asking the proper questions. But she does know that rifts of this kind, at least in her universe, tend to affect their surroundings in psychic and temporal ways. They don't make kittens appear.