can anyone please help me wit this story..

ok its this short story. i hate short stories.
its about a girl named angela. and she has this girl she doesn't like. and i want the ending to be them fighting. how do i do that if i want it to be a cliff hanger. like something thats unsloved. like mysterious. anyone can offer me a hand. and who knows how to write stories plaaeessssee. its due on monday:)