Film only. At first there being a witch in the hotel kitchen preparing the witches' food seems like a Contrived Coincidence (just so someone 'good' doesn't accidentally get turned into a mouse) but makes a lot of sense. Of course the witches would want one of their own to prepare their food since there are known witch hunters out there. A witch in a hotel kitchen is also in a very good position for getting to children.
A minor one, but can't the witches just wear a soft cap in between their wig and their scalp?