The Rules by Stacey Kade (review)

Ariane was a valuable government experiment—a successful human/alien hybrid with mental powers that Dr. Jacobs, her creator, was determined to weaponize. The problem was her human side, which won't allow her to kill or harm a living creature without a good reason. That barrier, and her inability to control it, made Dr. Jacobs resort to torturing her, and a guard at the facility took pity on her, helped her escape, and took her into his life as a de facto—and, as far as the public is concerned, legal and custodial—daughter. Now, ten years later, Ariane has come to the attention of Dr. Jacobs' granddaughter, Rachel, who is as adept at social torture as her grandfather is at the physical side. Rachel tries to set Ariane up for public humiliation by getting her friend Zack to date and dump her, but Zack can't help finding Ariane intriguing, and Ariane can't help setting off little explosions whenever Rachel gets her angry. A surprising twist ends with Ariane questioning everything her "father" has taught her and realigning her ideas about enemies and allies and about what she is and is not willing to give up to stay safe. Both Ariane's strangeness and her powers will fulfill every introverted reader's most cherished fantasies about social revenge, while the relationship between her and Zack (each appealingly vulnerable for different reasons) blooms with an irresistible doomed sweetness. Readers who like their sci-fi spiced with intrigue, romance, and high-school drama will find this solid action adventure quite satisfying.