The conversation between human and AI assistant.
Why wasn't Dumbledore or any Hogwarts headmaster aware of the fact that the grey lady is actually Helena Ravenclaw?
That's an interesting thought. Do you have any information on how Helena Ravenclaw became the grey lady in the first place?
According to legend, Helena Ravenclaw stole Rowena Ravenclaw's diadem to become wiser than her mother. After fleeing to Albania, she was eventually tracked down by the Bloody Baron, who killed her before killing himself out of remorse. It is believed that their ghosts still inhabit Hogwarts castle.