"Oh our apologies miss. alright boys pack up the crucifix we're at the wrong house!""Oh no, you've got the wrong witch. I'm the GOOD witch of the night fog forest."
She needs a convenient homonculus to posead the Dead Witch of the Forest. Finding a body would explain why the fog dispelled. Perhaps an impenetrable ward around the house, and the body outside it would protect the house from looting while convincing people that the threat of the witch is gone."Oh no, you've got the wrong witch. I'm the GOOD witch of the night fog forest."