Final answer:
The character Marji is not mentioned in the provided text. Instead, it discusses a decision by Bernice to seek Marjorie's advice on social success. This represents a turning point for Bernice's character.
Step-by-step explanation:
The student question pertains to what Marji decided when she was six. However, based on the context provided, it seems there may be some confusion as there is no character named Marji mentioned. The excerpts provided mainly discuss the characters Marjorie and Bernice.
The closest relevant decision made by a character in the provided text is Bernice's resolution. Bernice decides to ask Marjorie for advice on being more socially successful, indicating a willingness to change to gain popularity and the approval of her peers. This decision reflects a significant point in Bernice's character development within the story.