I was recently reminded of this when reading a story about a zombie apocalypse and the trope of keeping a zombified loved one locked away in hopes of a cure. In this case, I don't think there was an apocalypse, but it was simply a matter of that the mother hungered for flesh. Her daughters (I think there were more than one) keep her locked away in the basement and feed her stray animals (I think that there was an aspect where the mother wouldn't eat any meat that wasn't still alive) and generally tried to keep anyone else from realizing the situation, although I think they were starting to run out of animals to abduct. It was all rendered very much in a "young children trying to keep the world from knowing they were on their own" vein, but with a slightly fantastic vein.
The other story aspect, and I think the one that was introduced at the beginning of the book, involved a girl who loved trees, and associated them with childhood memories. When one of them is cut down (I think on someone else's property, so they had a right to cut it down), she goes on a mild rampage of vandalism of their house before she's picked up by the police, who basically pass it off as a childish tantrum. I don't recall what association, if any, she has with the girl with the mother in the basement.
I read this somewhere in the last ten years (I know I read it while married because I remember trying to explain the plot to my wife), I think about four years ago in 2018, as a book checked out from the library (which, unfortunately, as I've mentioned before, involves a long enough history that it makes a scan through titles time-prohibitive). I'm 90% certain it was a physical book, not an eBook. I don't think I finished it, in part due to other obligations at the time, and in part because the narrative depressed me.
