Blood of Two Worlds. Blood of Two Worlds Trilogy, #4

All three books of the trilogy in a single volume. 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 a simple theft of a hamburger ends up triggering 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 encounters an enigmatic vampire who seems determined to make her life impossible. However, in the shadows of this new world, she will face a disturbing truth: dreams can be enchanting, but they also turn into nightmares. Cassie will learn that true family goes beyond blood, and that power lies in daring to accept her true nature.