Good thing Childermass is around to take better notes for him. Unfortunately, there aren't many notes regarding the Ringmaster herself just yet. Someday, perhaps, but until then, he can only offer a shrug.

"I'm sure she does, though I might not rule out the carnival itself having its own sort of magic. Could be she built it to be able to move itself."

There's no way of knowing, at least none that he can think of to check that, short of asking the Ringmaster herself. It just seems a little more streamlined if some of it was built in to him, but that's only one theory.