I Don't Want to Drink Your Blood Anymore (1970)

Eiko, a Japanese American teenage vampire, suffering from agoraphobia caused by the trauma from the night her family was murdered and she was turned, is unable and unwilling to leave her family’s home. And she not only loses track of time, but time itself. Eiko spends most of her years avoiding others and trying not to live life as a vampire, but the world won’t leave her alone.