You might be thinking of:
* Aunt Clara: She's Samantha's kooky, often-meddling, and always-magical aunt. She's known for her flamboyant personality, odd inventions, and tendency to cause chaos.
* Endora: Samantha's powerful, often-uncooperative, and frequently-frustrating mother, who is also a witch.
It's possible you're mixing up *Bewitched* with another show or film. Do you have any other details about the character you're thinking of?