About her: Edit
Sheila Sommers is Darrin Stephens' ex-fiancee, who is beautiful, but a rich and spoiled snob. Sheila in Season 1
After Darrin marries Samantha, Sheila humiliates her by commenting on her appearance and even suggests helping her.
Samantha used her witchcraft to cause Sheila to become "undone" so everyone could see what she really was. Darrin wasn't happy about it, but believed she deserved it.
The episodes she is in: I, Darrin, Take This Witch, Samantha (Season 1, Episode 1)
Snob in the Grass (Season 4 Episode 19)If They Never Met (Season 4 Episode 20)