Brilliant - Rachel Vail

Everybody knows who Quinn Avery is. She's the smart, calm, responsible Avery sister, the one who's kept it together in spite of all that's happened since their mom lost her job. But when the family house goes up for sale and Quinn faces the prospect of losing the home she loves, something snaps inside her, and a new, wild, reckless Quinn emerges.

Soon Quinn's lying, sneaking out, and partying with a brand-new crowd. When Quinn adds ditching her best friends and kissing the wrong boys--including her sister's boyfriend and her own piano teacher--to her list of crimes, she may finally have gone too far. Can Quinn find her way back to the family that needs her and the only boy she's ever loved?