the movie is from the 1990’s plus. I watched it a few times on HBO channels when I was younger. I think the title starts with a C,and i also think mila kunis stars as the pyscho brown haired girl but im not positive. this is what i can remember. A blonde haired girl goes to some rich school or club of some sort. The brown hair girl befriends her and eventually becomes jeaolus of her, she sets the blonde hair girl up and the blondie ends up in a mental hospital. the blondie hides her medication and escapes the hospital. she goes to the dance and ends up fighting the brown hair girl. the brown hair girl had a shovel. the movie ends up with the brown hair girl being in the mental hospital. thats the best of my memory pleaseeeeeeee help! thanks!