they won't hurt, either
sounds corny but it isn't the flowers and chocolate, it's the fact that you went out and bought them that means something
also, clean that dress up best you can or take it to the cleaners
also, write her a letter of apology and lie your ass off
also, apologize to her in front of her parents, that's impressive
i wouldn't go much further than that right now or you will come off looking weak and desperate