Muriel MacDougall and The Mad God by C. Kiefer
In the year 2073, Muriel MacDougall just wants to lead a normal life. But after she is assaulted by a bird on her way to school, she is thrown into a thicket of conspiracies, alternate worlds, portals, and cults.
Learning that she is a wereraven and therefore a key ingredient for the release of the Mad God at full moon, is she going to escape her fate, or is she going to doom everyone?