Black with a bit of color might work! One of my daughters has ebony black hair so didn't want an all-black dress on top of that. She found one that had red accents and that worked out beautifully!
Y'all are telling her to get a black dress, but I read it as they already have a dress that her daughter looks good in that is a color. If she looks good and feels good in this dress, she should wear it.
Besides, black IS a sorority color, and Theta has a chapter at Ole Miss.
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Actually, amIblue? is a troublemaker. Go pick on her. --AZTheta