Relentless — Suzanne Cox

Now that she knows she's a Lycernian werewolf, Alexis Miller has decided to join her aunt at The Project, where they train young werewolves to fight their ancient enemies the Fenryrians.
But Alexis isn't there just to become a warrior for her pack. Before she found out she was a werewolf she fell in love with Eric, a Fenryrian and she's determined not to let the differences between their packs keep them apart.

At The Project she begins to find that she has talents far beyond what she or her Aunt Louise ever imagined. But when the Feneryrians abduct two students from the project she and her friends will have to use all their talents to try and get them back. But everyone has secrets. Even Alexis. Even Eric. In the end the secrets could tear them all apart.