[pavel_lishin]

> I think this is a really strong suggestion that everything told from the point-of-view of the spiders is passing through the same narrator.

This is explicitly hinted at when, uh, Vinh finds papers in Trixia's room that are identical to the first chapter from the point of view of the spiders. The point is that everything written about the spiders/from their perspective is actually her "novelization" of what happened.