Well this is what I would do...
give her a chocolate bar, or some food item she likes, but poisen it first... After she eats it, tell her she only has 20 minutes to live. But if she agrees to come to homecomming with you, you might give her the antidote...
I say might because most people who say stupid **** like this also have a slight case of necrophilia...
Hey, whatever gets your rocks of man... i'm not judging you...
[note: you could just slip a note in the chocolate too... a golden ticket to your willy wonka...factory... persay.]