Final answer:
Mrs. Murry may believe Meg struggles in school due to the pressure of managing home responsibilities, a lack of familial support, and the challenges of fitting in with a curriculum designed for higher social classes, affecting her confidence and performance.
Step-by-step explanation:
Mrs. Murry likely believes that Meg does poorly in school due to a combination of factors that are common among students from working-class families or those who lack certain social advantages. The fulfillment of one's education is closely linked to both social class and the ability to manage schoolwork with other responsibilities. In Meg's fictional case, factors contributing to her difficulties could include a lack of support at home, financial responsibilities, insufficient study environments, or a curriculum that caters to students from higher social classes. Additionally, social interactions and perceptions, as highlighted in the passages provided, show that subjective experiences and expectations from peers and family can heavily influence a student's confidence and academic performance.