The "dreams" of reality in between make me think that she's probably making all of this up in her own subconscious, but to such an excellent degree of realism that the events within are occurring naturally beyond her expectation.
What would happen if she were to die in her comatose state?
Maybe it's a sudden blip during the story, then darkness. She's dead.
Or her life will flash before her eyes, exponentially speeding up her perception in reality up to the last second - allowing Ayrin to live the rest of her life in this fictional world before dying in both realities.
Anyway, bambam adorbs. Let's goooo