Possible Clues:

• Monstrous female
• In Greek and Roman mythology, a bloodsucking serpent-witch
• Alluring vampire
• Vampirelike female monster
• Article about friend — all in French — becoming monster
• Sorceress could bring about a mail mix-up
• Mythological half-woman monster
• Snake woman in real amiable poem
• In classical mythology, a bloodsucking serpent-witch
• Snaky woman in American city takes road to American capital