The Party's Over — Caroline B. Cooney

As her friends go off to college and she opts for work, Hallie Revness soon discovers that her role as prom queen, cheerleading captain, and girlfriend of popular Jaz will do little to help her in the real world.

Hallie Revness feels like she owns the world. Prom queen, cheerleader and half of what seems like the perfect couple, her senior year and the summer after it are perfect - filled with friends, parties and romance.

But then Hallie's friends leave to go to college and Hallie is left behind. For Hallie is seems that the party is over until things take an unexpected turn...