Francesca Lia Block 
Waters & the Wild [EPUB ebook] 

When Bee woke up, there was a girl standing in her room. "You are me, " the girl said. Then she was gone.I am a thirteen-year-old double Gemini. I get bad grades, write poetry with my left hand, dance in my room, surf the net. I Google images of the tattoos my mom won’t let me get. . . .But my world belongs to someone else. Someone who lives below the concrete of Los Angeles, someone with wild eyes and twigs in her hair.And I think she wants her life back.