Okay, Emma is confused by how the name thing is working here, but she doesn't really have the vocabulary to ask yet.

"No know," she repeats. Hmm. Does it have to be a mouse? "No mouse, yes cat, yes horse. Crystal Pyay cat not sleep?"

There is a handy reference book of various animal species she can point to, here. They do in fact have a cat- there's one in the stables that keeps the mice out (which is apparently suboptimal, at the moment)- so if Emma can find it, maybe Crystal-Pyay can use that.