Key of the elements

Four girls are in year nine at a boarding school and their is tension between them. All of them are in the way of each other and will stop at nothing to get what they want. But when a magic key gives them all uncontrollable elemental powers, they have to work together in order to save everyone who tries to annoy them. Things get even worse when 'accidents' start happening on the year nine girls. The leads have to figure out how to stop it before they get targeted themselves.