I'm a vampire who hates werewolfs... then i get imprinted by one!

It's about a girl who is a vampire. She's 15 and hates werewolfs because they killed her parents. She has to take care of her baby sister who is 13. She loves her sister more than anything and if she had to give her own life to save her from danger, she would. Her sister and her are always moving from home to home. But when they get to a home in an area with werewolfs, she will do everything in her power to protect her little sister and her... but she doesn't expect the alpha to imprint on her.