Snakewoman

Synopsis: This horror film is set in a small turn-of-the-century English village where a herpetologist is trying to cure his wife's insanity with injections of snake venom. He seems to succeed and soon afterward she gets pregnant and bears him a beautiful little girl with a horrible talent: she can transform herself into a snake whenever she wants to. She soon grows up to become the scourge of the village men.   Source: allmovie.com