Since you enjoyed Just Listen by Sarah Dessen, you may enjoy some of her other books such as How to Deal, That Summer, and The Truth About
Forever. You might also enjoy the following:
Hope Was Here by Joan Bauer. (and anything by Joan Bauer)
When sixteen-year-old Hope and the aunt who has raised her move from
Brooklyn to Mulhoney, Wisconsin, to work as waitress and cook in the
Welcome Stairways diner, they become involved with the diner owner's
political campaign to oust the town's corrupt mayor.