Strange Angels: 2 Betrayals by Lili St. Crow.
Dru Anderson’s parents are gone, her best friend is a werewolf, and she’s just learned that she’s not entirely human. Now Dru is stuck at a secret New England school for other teens like her, and she’s the only girl and is totally surrounded by tons of cute boys. But a traitor in the Order wants Dru dead and she can’t trust anyone except for Graves. Too bad he’s being kept busy with a new crew of wulfen teens and doesn’t have time for her. As she learns the truth about who she can and can’t trust, Dru’s only hope may be to save herself although the one gift that makes her special is draining away, and she doesn’t know how to get it back. Will Dru survive long enough to find out who is really after her? Or is she destined for the same fate as her murdered parents?