I don’t consider that to be out of bounds for her to do. It makes sense for the parents to make a list of books their kids cannot read rather than depriving the entire community of certain books just because of someone’s personal dislike.

Where I work, there are at least a good dozen books I think are utterly worthless, but it’s the public that decides the worth of those books by increasing or decreasing circulation on those books, not me. If it’s a popular book, it stays so we can keep up circulation. If the public is checking those books out then they stay. When the public loses interest and no longer check out the books, we weed them out. We sell them or throw them out to make room for new popular books. A handful of people in the community don’t get to decide what grown folks want to read unless they actually work for the library, and we mostly choose books by what is useful, entertaining, and will bring the people into the library.