User blog comment:Monkey.D.Me/Chapter 666: （╯°□°）╯︵ ┻━┻/@comment-94.195.39.181-20120511143547/@comment-1595565-20120512174503

A Zoan makes more sense than animal parts. I mean, she wasn't sick when the other people were, meaning she came later, after the gas was dissipated and purified, so there'd be no need for her to get new body parts. As for why she's always in animal form, maybe she's like Clown and just prefers to be in a transformed state.