If I'm remembering correctly, I believe I learned from folks on this forum that while the episode was originally conceived as a pilot, by the time they actually shot it, that was no longer in the cards and it was just being shot as another episode. If that's so, then they really did just hire her for a one-off.Hmm, maybe they cast her with an eye toward the potential spinoff series in which she'd presumably be a recurring player. After all, cats are very flexible, so it makes sense to cast a contortionist as the cat's human form.