Sybil Hawthorne does not correspond to a widely known public figure, historical person, or major character in literature or popular culture based on current records. The name appears to be a combination or potential mix-up of two distinct references:
By sixteen, she could read a handshake like a palm. By twenty, she knew which guests would faint before the séance began. She draped herself in velvet and silence, let them believe her gifts were candles and showmanship. Let them leave with goosebumps and a story. sybil hawthorne