I wish Allison spent less time explaining everything through the dialogue of the other characters and just letting the reader try and figure out what’s going on. She then could use that time to let the characters talk a little more about each other before we meet them so that we have to reassess our initial impressions of them.
Allison should trust her unreliable narrator (and us) more.
Remember those PBS and BBC nature documentaries where they would take time-lapse photos of decaying fauna and flora then speed it up so strawberries would be enveloped by a gray-blue mold and cavity under their bloated weight or dead rodents would twitch and vibrate with a thousand hungry maggots until only the bones were left among green sprouting vines? That’s kinda what is happening as the book winds down.