[Earthlings] Sayaka Murata: This world is a factory for making human beings. Working tools and reproductive organs
Normal here seems to focus more on two things: working and being productive, and having children for the sake of procreation. The influence of her parents is significant, and Murata-san is aware, even as a child, of the expectations of her children and the imprint of what her parents consider to be normal values, and she probably projects her own discomfort with these expectations into the novel.