Boro, you have to keep in mind that this is exactly what wolves do; they lie. And if they are in a "cri-ice-is" as Mister Punny would say, they'll take advantage of any....well, advantage. If there's a secret role they can make up as much as they like and no one (except for the secret role, and who believes second reveals most of the time anyway?) could contest them.
And besides, keep this in mind. Who's to say that the secret role isn't a modified wolf? (Think of Shasta's game where there was a seer wolf, etc.) Lottie could be telling the truth and still be evil.
Speaking of whipping into shape, I'm surprised you didn't consider that.
ETA: x'd with Nerwen