The Ecstasy of Isabel Mann (2016)

Teenager Isabel Mann is seduced by a violent sect of daywalking vampires Her classmates start to go missing attracting two detectivesThings get weird as the disturbed teenager kills at will in the nearby woods Shes aided by head vampire Alejo and eerily by Isabels lost mother an earlier recruit Shes trained in the art of the kill with horrifically bloody results for those she loves