Darkfusion series by Neal Shusterman

Dread Locks
Taking elements of fairy tales and Greek mythology tells the story of fourteen-year-old Parker Bear, rich and utterly bored with life—until a new girl arrives in town. Tara’s eyes are always hidden behind designer sunglasses, and her hair, blond with glimmering spirals, seems almost alive. Parker watches, fascinated, as one by one Tara chooses high school students to befriend; he even helps her by making the necessary introductions. Over time, her "friends" develop strange quirks, such as drinking gallons of milk, eating dirt, and becoming lethargic. By the time Parker realizes what Tara is doing, he is too embroiled to stop her. In fact, she has endowed him with certain cravings of his own. ..to absorb some of her terrible powers. But now his brother and sister are changing ... will he be able to save them or even himself?

Internest read. I liked the Medusa/Goldilocks elements that come out. I'll be interested to see the future titles.