It seemed kind of obvious from the beginning... (spoilers)
That they are both dead, both lost spirits, lost between worlds, in purgatory, whatever, but dead, it's just that she doesn't know it. For example, no one heard her in the bathroom because she is a ghost, as opposed to they are ghosts and that's why they didn't hear her. The repeating history also makes sense in that, if she gets stuck in the bathroom every time, but eventually gets out, then no one would react. Either way, she is dead from the beginning, a ghost. Isn't this obvious?
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