She's not actually sure what happened. There was an alarm, and there were people screaming, and there was a darkness beyond comprehension, an all-consuming empty hunger, the feeling of your whole self bleeding away into the Abyss, which is classically a nabasu sort of thing but could've also been a vrolikai or something, or conceivably just someone's misfiring fear spell. Then something stabbed her in the gut and ate her alive. 

So actually she does know what happened, basically. It's that she died.