The Jilting of Granny Weatherall Old Age Quotes

How we cite our quotes: (Paragraph)

Quote #10

"This is Doctor Harry, Mrs. Weatherall. I never saw you look so young and happy!" "Ah, I'll never be young again—but I'd be happy if they'd let me lie in peace and get rested." She thought she spoke up loudly, but no one answered (38-40).

Hey, we were just tricked. What's the effect of putting Granny's response to the doctor in quotation marks and then turning around to suggest that Granny didn't actually speak these words aloud?