I liked this one alright. There was some pretty prose and some cool descriptions that I enjoyed. I had two basic problems with it, however, one of which prevented me from really sinking into the piece.
I couldn't get a handle on the narrator's age until almost the very end. The clues may have been there and I missed them, but it was truly weird to think of a kid saying that stuff about the troll. I don't know what gave me the idea the protagonist was young, maybe the simplistic thought patterns and the rather basic sentence structure (which I think were supposed to tell me senile dementia instead but I miscued, I guess), or the voice the reader was using. Maybe that line about the milk making her sleepy, which I associate with children. Something just telegraphed young to me and I kept having to readjust my mental picture. I wish I'd definitively known her age sooner.
The second, less bothersome, catch was that I was never sure whether there was anything independently supernatural or whether it was all related to her dementia. I'm pretty sure we're supposed to think not, but not completely sure, because many of the things that at first appeared to be dementia (the boy in the fridge, frex) were later made clear to the audience as part of her crazies, while others remained completely unexplained (the snakes in the woman's hair from across the street). But I can live with that level of ambiguity.
I had a lot of weird thoughts about whether the woman thought she'd gotten rid of/killed/aborted her child or just didn't remember him because he wasn't a kid anymore. Or maybe there was another child she'd lost? It was hard to tell.
There was a lot of thematic recurrence that I was interested in (milk, the safeguarding of children, life observed rather than lived, helpless transformations -- from childhood to adulthood, from adulthood to old age, from hostage to troll wife, and so on). I would have liked a tighter knit to the weave, and to have had only those delusions which worked within the framework of the main themes to be included (the gorgon felt red herringy from a thematic pov, included in order to highlight the clinical symptoms mentioned upthread).