I guess it depends how you look at it. From my point of view the speaker isn’t actually talking about themselves. That is the “royal” part. And I mean she does say “as if” to back up that yes, she is not actually including herself.

No, this is the right meaning royal we. If you say “we are going into battle” it is talking about the person being talked to not the person talking. So in this case “We don’t eat that” would be implying that the cat doesn’t eat that, not actually saying anything about the speaker even though “we” would imply they are included.