Hey, isabeau777! thanks for voting on my story 'Loved by a vampire' and also for the comments too. And to answer your question about the number of vampires at her school, the number isn't that high. You'll find out later in the story.
Then your other question on why Devlin's blood could heal Annabelle; it's because his blood allows him rapidly heal himself and with the bond he shares with Annabelle, it should heal her too.
Oh, and lastly, thanks for following me too ;)