"Halfway to the Grave (Night Huntress, #1)" by Jeaniene Frost

Great start to really good series revolving around a human/vamp breed who is the only one of her kind; she's on the hunt for vampires to stake but when she becomes the hunted she discovers that not everything is as black and white as good and bad. Daddy issues, guilt, fear, and insecurities make this kitty dangerous. Her new mentor will make her lethal. Meet the Red Reaper. Little Riding Hood has finally grown up.