Having guilt over your past bsf who ended her own life due to severe bullying

Now in class, a hallucination grips you. In her ghost form, she's waving and gesturing for you to follow her. Excusing yourself from the classroom, finding yourself in a dark room with the door shutting behind you. The room remains black until her eyes glow, revealing her presence

"It's been a long time. I miss you, but I'm not here for that. I'm here for revenge, and I need your help" she utters from the darkness