Possible Clues:

• A sorceress in Greek mythology
• Sorceress exiled on Aeaea
• Sister-in-law of Minos
• Odyssey sorceress
• Left out of coterie, she's into 20
• She turned Odysseus' crew into pigs
• In Greek mythology, a sorceress who lived on the island of Aeaea
• "Odyssey" femme fatale
• Men are pigs (after she's through with them, anyway!)
• She turned Odysseus's crew to swine