We All Know The Wedding's Over Book 3 (Snow White's Poison Bite / Kristy K. Illings)

Her parents, the football team, the cheerleaders, they're all dead. Going into the final kill of the night Kristy felt like she was forgetting something, something important, but she brushed it off. When someone calls her name as they flee the sceen she realizes what she forgot.
When Derek enters the picture Jeremy hates him and that hate only become's stronger as Derek get's closer and closer to the girl he loves.