Mother of Dana and Gillian MacArthur and former wife of Randy MacArthur. She was estranged from both daughters as her new partner never wanted children and she let him get in between them. According to Paige Winterbourne, this was very atypical behavior for a witch, since witches pride themselves on the strong familial bonds. Even when her oldest daughter, Dana, was attacked in Industrial Magic, she was not prepared to come to her daughter's side in the hospital. After Dana died, she did also not attend the funeral.
In another atypical move, she did not teach her daughters witchcraft, as evidenced by Gillian at the end of Industrial Magic. Randy MacArthur, the girls' father, then requested Paige to start teaching Gillian long-distance. This concept would ultimately grow into the Sabrina School.