Saving Amy by Sarah Natalia Lee

Saving Amy, a tale of finding love in a graveyard; love between a beautiful, ageless vampiress and a teenaged girl thrown into her father's home - a father she barely remembers - by the untimely death of her mother. As Emma and her sisters try to adjust to their new family life, she searches for love, acceptance, joy, and finds all of these and more. Emma and Amy face many dangers together and must break the grip of Madam Noctis, the vampire who stole Amy's soul years before. Or had she?