“That’s because your mother wanted to show you off.”
Because Daisy never once understood adulthood to be hard work, she never really grew up. She is still a young girl, playing house and with dolls. Her daughter is simply a plaything. A pretty doll that walks and talks to be dressed up and and shown to other people. This also links in with the theme that her child is almost non-existent — Daisy has a nanny yet she doesn’t work, she doesn’t really want to acknowledge the child as a real person.
To help improve the meaning of these lyrics, visit “The Great Gatsby (Chapter VII)” by F. Scott Fitzgerald and leave a comment on the lyrics box