The Poker Diaries by Liza Conrad

Fifteen-year-old Lulu bounces back and forth between the high society life of her mother and the illicit world of her gambling father. When Lulu's uptown friend Dack loses more than he can afford to lose at a poker game, she finds herself entering a high stakes game to win it back. After Lulu's mother announces her engagement to the Mayor of New York City, the stakes in this not-quite-legal game increase after Lulu is blackmailed into playing in a high-stakes, definitely illegal that could cost Lulu more than she is prepared to lose. An interesting novel for fans of poker with some important rules for gambling- such as rule #2- "don't bet what you can't afford to lose". Lulu is a likeable narrator who is content in her life flowing between uptown and downtown. She only wants to do what is right but finds herself quickly in over her head.