This essay explores how adolescent girls in two pieces of children’s fiction are portrayed in children’s literature from the start and end of the 20th century to examine how they perform their gender in relation to expectations as informed by the Angel in the House discourse. Anne of Green Gables and the Harry Potter series were published at the start and end of the twentieth century, and both texts engage with the discourse. Using Judith Butler’s theory of Gender Performativity, this essay demonstrates that the Angel in the House discourse continues to influence expectations of how adolescent girls should behave, particularly with regards to being responsible for upholding the moral code to ensure the social standing of their family. However, they differ in regard to other aspects of the discourse, indicating that parts of the discourse appear to have lessened over the course of the 20th century.