Along for the Ride by Sarah Dessen

Auden is about to start college in the fall, and decides to escape her control-freak professor mom to spend the summer with her novelist father, his new young wife, and their brand-new baby daughter, Thisbe. Over the course of the summer, Auden tackles many new projects: learning to ride a bike, making real connections with peers, facing the emotional fallout of her parents’ divorce, distancing herself from her mother, and falling in love with Eli, a fellow insomniac bicyclist recovering from his own traumas.