Impure blood. Blood of Two Worlds Trilogy, #1

In the dark streets of a big city, where hope has vanished, Cassie discovers an ancient power lying dormant within her: the ability to transform into a wolf. This not only grants her freedom but also a dangerous escape from her painful reality of living on the streets without a family. But when the simple theft of a hamburger triggers her transformation, Cassie finds herself face to face with a mysterious force, more beautiful and powerful than anything she has ever known before.
Dragged into a secret world, hidden in plain sight, Cassie stumbles upon an enigmatic vampire who seems determined to make her life impossible. However, in the shadows of this new world, she will confront an unsettling truth: dreams can be enchanting, but they also morph into nightmares. Cassie will learn that true family goes beyond blood and that power lies in daring to embrace her true nature.