Answer:
It seems like Maggie sees her sister Dee as perfect. She wants to be more like her. It says that Maggie was "eying her sister with a mixture of envy and awe." According to this story, Dee always gets what she wants. The narrator says that the world has never learned how to tell Dee "no." Maggie is self conscious about her burn scars, and it seems like she is even more self conscious around her older sister.
hope this helps