The Pack: Mercy's Choice (Born to be Were series Book 2)

Born of two ancient packs Mercy was always destined to take her place amongst the werewolf community. Unfortunately, her family kept that secret from her until they were forced to admit the changes in her had more to do with being a werewolf than a growing teenager.
Devastated by her family’s betrayal and held back by her own fears Mercy struggles to accept her werewolf side until a very desirable she-wolf arrives in town and threatens her relationship with Alec, the male werewolf that claims Mercy is the female destined to be his.
Now faced with losing her mate to the scheming female, Mercy must overcome her past fears and embrace what it truly means to be a werewolf, but in order for that to happen she must trust the very people who withheld her destiny from her and begin learning how to be part of the pack.