The Mother
I actually liked the film's concept, if not the movie in its entirety, but even accepting the vaguely-Freudian-mother-daughter-father-triangle, the scene where the mother's apparent shame at being caught in the nude by her daughter, who didn't appear at all bothered, just completely threw me off. Not only was the nudity unnecessary because of the reactions (other than as a gratuity for people who won't see a movie unless it has some female nudity somewhere) but most of the mother's attitude towards her daughter made as much sense to me as the priest being called in the other scenario.
Revenge is a dish that best goes stale.