Stacy: Attack of the Schoolgirl Zombies

Girls between the age of 15 to 17 all seem to die mysteriously and turn into flesh-eating zombies and the only way to put them to a final rest is for them to be re-killed by their loved ones and hacked up into 165 pieces. Then we have some girls "army" that are out to destroy the Stacy's which is what they call these girls once turned into a zombie.