How is Ellen Grape portrayed in the novel, What’s Eating Gilbert Grape?

Ellen just turned sixteen last and recently had her braces removed from her teeth. Ever since, she is boy crazy and very sexual. Ellen's only interests are painting her fingernails, what she wears and how she looks. Ellen is also very hung up on what other people think of her. As the prettiest girl in town, Ellen is also the one most affected when Becky comes to town and takes over Ellen's place as the prettiest girl in town.