The Shining 1980: Who/what was in room 237?

I just saw The Shining for first time in long time and there is once sequence I never understood. The part wher Jack goes in room 237 and sees first the young woman, who turns into a rotting old hag, chasing him out of the room..while she is chasing him out, the camera cuts to the bathtub where she was where... show more I just saw The Shining for first time in long time and there is once sequence I never understood. The part wher Jack goes in room 237 and sees first the young woman, who turns into a rotting old hag, chasing him out of the room..while she is chasing him out, the camera cuts to the bathtub where she was where another hag is rising from the tub. Who was the woman in room 237? The caretaker Grady's murdered wife, or just a guest who died, or was the room just the beating heart of the evil presence in the hotel?
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