In The Shadows Randee — Lee Nelson

After the death of her mother, Rose Knight's father turned to alcohol to cope with her death, leaving only Rose to provide for her younger sister. Now, she only wants two things in life, to graduate high school and keep her little sister out of foster care. That is, until an old friend returns from the grave - and the underworld - to help Rose remember the repressed memories of her childhood.
Rose is a werewolf, Areon is a God, and Hades is threatening to destroy all of humanity. If she is to save the world, Rose will have to weigh survival against humanity and life over love.