lost in the world what doesn't exist

there's girl named Monica who is lost in the world what doesn't exist. She lost her best friend Jessica. No one knows where is she.
in her dreams she can see an old man, just staring at her, she seems her everyday, at home at school, at park, EVRYDAY. one day she woke up at the floor, no one was at home. scared she went to school and saw this man as a new history teacher. teacher was always asking only her questions. not the simple question, questions like: when are you at home? when arent your parents at home? she knew what it's not good, and everytime when he was asking questions like this she was lying.
but then he..