Her Dark Destiny (Hunters of the Dark #1)

Teenager Shanna Hunt has been hunting demons since her parents were murdered by them. She’s used to doing things alone, her own way, but one fateful night throws her into the company of a team of hunters, each specializing in a particular kind of monster: vampires, werewolves, witches, shape-shifters… This newly-formed team should be an unstoppable force for whatever is out there picking off individual hunters across the globe, but their first battle together against the monsters of the night could be their last.