Lila's Story (Sweet Valley High Super Star #1)
Francine Pascal, Kate William

Lila Fowler is the richest girl at Sweet Valley High. She wears designer clothes, lives in a mansion, and has an allowance at least three times the size of her friends'. And as an only child, she's always had all of her father's affection. Lila has everything a girl could possibly want.
But before long Lila's happiness is shattered. Her father brings home a beautiful new girlfriend, Joan. And Joan has a daughter, Jacqueline, who's the same age as Lila. Soon it seems that Joan and Jacqueline are taking over Fowler Crest, and Lila is furious. Then Mr. Fowler drops a bombshell--he and Joan are getting married! If Lila can't stop them, her life will change forever!