Home Ever After by C.L. Carner

Sophie wakes up in the hospital unable to remember much more than her own name and her mission: find Willow. The things Sophie can remember seem out of time for the world before her now, strange carriages that need no horses, plastic boxes that show you glimpses of other people's lives, and buildings that stretch into the sky. How is she going to complete her mission in this strange place when she can't remember who Willow even is.