The purpose of referring to Ruthie as "Edna's Ruthie" is:
1. To reveal who is Edna's daughter.
By calling Ruthie "Edna's Ruthie," the relationship between Edna and Ruthie is highlighted, indicating that Ruthie belongs to Edna. This naming convention emphasizes the maternal connection between Edna and Ruthie, clarifying that Ruthie is Edna's daughter. This helps establish the family relationship and character dynamics between Edna and Ruthie in the context of the story or situation being described.
