From the moment that Daryl moved to Eastwick, Felicia seemed to be tormented by him.
The moment that Felicia hears that someone (later revealed to be Daryl) bought the Lennox mansion, she drops what she is carrying and goes on a rant to her husband:
Felicia: I have this feeling, Clyde. I have the most terrible feeling. Something... Something crawling inside me. Something evil. Only it's more than a feeling. Something is happening, Clyde.
Later at a concert, Felicia makes a comment about Daryl's name and Sukie's pearls snap off of her neck sending Felicia tumbling down the stairs, breaking her leg.
After this incident, Felicia goes mad trying to warn everyone in town that there is evil going on in Daryl's mansion. Daryl eventually sends her into a fit of madness with having her vomit cherry seeds that him and the three women at his house are eating. Felicia's husband finally snaps and proceeds to kill her.
What is the purpose for Daryl tormenting Felicia the way that he did?