She had the Body of a Goddess and the Soul of a Witch.

A student researching the German settlements of Central Texas unearths the grave of a reputed witch. The witch (who happens to be both beautiful and naked) rises from her grave and embarks on a campaign of seduction and murder against the descendants of her persecutors. It's up to the student to stop her bloody reign of terror-if he can resist the seductive powers of her evil beauty.