Used book – Women of the Otherworld, Book 1: Bitten, Kelley Armstrong

Elena Michaels is a werewolf, and the only female of her kind. That's already unusual. But on top of that, she does everything she can to be normal. She wants an ordinary life, without her inhuman desires, her savagery, her hunger, and her hunting instincts.

But the Pack calls on her. Breaking the clan's laws, deviants threaten to expose their existence. Elena complies, because blood loyalty is unquestionable. And during her fight, she will discover her true nature...