Bait by Kasi Blake

Welcome to Van Helsing Academy... where survival trumps grades. 
      
An unseen enemy haunts the halls of the academy. Not even Van Helsing himself knows what deadly creature  is stalking his students and killing them on their birthdays. Unfortunately, his daughter has just enrolled.
          
Weary of hiding from monsters, Bay-Lee can't wait to get started. Even if she is ranked as Bait, the lowest form of hunter, she knows she can prove her worth to her father. It won't be easy. The other students resent her, assuming she'll be given special treatment, and their best warrior refuses to mentor her.

Nick Gallos blames Bay-Lee for the dark turn his life has taken, and he's vowed to get his revenge. But every time he looks into her eyes he feels a strange tug on his cold heart. Can she save him from a terrible fate even though she's part of the problem.
         
Bay-Lee and her new friends must solve the mystery and catch a supernatural killer before it comes for them. Will her first year at Van Helsing Academy be her last?                  This has a sweet romance, great action, and lots of twists.