Possible Clues:

• She had some bad hair days
• No beauty, but she was ill-used in some degree
• Jellyfish petrifying woman
• This hideous female is not amused
• Amused by the mythical gorgon?
• The chief of the Gorgons eventually slain by Perseus
• By the look of her, she might make you one of 13 across
• Gorgon killed by Perseus - jellyfish
• Jellyfish in America at bottom of sea
• She used with mother around to give one a stony stare