Let's Scare Jessica to Death (1971)

Synopsis
This eerie low-budget chiller has recently released mental patient Jessica (Zohra Lampert) moving to a Connecticut farm with her husband and some friends. But a strange girl named Emily is at the farm, too, and it soon becomes obvious that she is somehow related to a young woman who drowned on her wedding day in the 1800s. Is Emily a vampiric ghost? Are the hostile townsfolk all zombies? Or is Jessica losing her mind once again? ~ Robert Firsching, All Movie Guide