He can, yes - he is not very good at it, and he cannot fool any kind of mage, but he can fool the ordinary eyes of ordinary folk. Or at least he could, ten thousand years ago when last he tried.

He can try again, he supposes.

Invisibility is a good thought. If she can find somewhere to put him where no one will stumble across the sleeping demon. In a box, perhaps. (He has done that before.)