Mrs. Porter is the eccentric old woman who lives next to the Brewer compound. Karen Brewer thinks that her real name is Morbidda Destiny and she is witch. The reasons that Karen thinks this are unconclusive, however, Karen succeeds in scaring the babysitters on several occasions.
Mrs Porter has a granddaughter named Drucilla.
Possible reasons she might be a witch:
She dresses all in black.
She likes to garden.
Once, she called Boo-Boo a "rapscallion", and because Karen didn't know what it means, Karen assumed it was a spell.