My sister wants to eat me. Every time I cook steak for my sister, she says it's not my brother's meat. She once bit my arm while I was sleeping and bled.
Your sister probably watched some unhealthy horror movies, ghost movies, and got into the play too deeply, or her brain was stimulated and hit by something, which made her hallucinate, psychologically distorted and abnormal. She should ask her family to take her to see a psychiatrist at once, otherwise the consequences are unpredictable and unexpected things may happen.