Voodoo doll - initial idea

Girl finds voodoo doll but thinks nothing of it and puts away in her bedside table but starts to be bullied at school. She starts to use the voodoo doll to get revenge on the bullies by saying their name then sticking a pin it which only hurts the victims however one day the bullying is so bad that she rushes home and takes her anger out on the doll and uses the main bullies name, by doing so she goes too far and accidentally kills the main bully using the voodoo doll.