Old Memories Haunting My Dreams

When Liao Bing wakes up, she discovers that her world holds only memories from before she was seven. She learns that her older brother died three years ago, that she spent three years in a vegetative state, and that she has a mental disorder. What story lies behind it all, and how will she uncover the truth, step by step? This is a short story, under twenty thousand words, written as practice.