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Her "popular" books mainly discuss looks. My daughter has noted that the blond girls are more popular than girls of color.
There are many wonderful books with the main character being a well-liked girl who may be Latina, Asian, African American, Jewish, Italian, etc, and not blonde. Reading books like these may be a form of bibliotherapy and help reinforce that people with every look from every culture are popular, well-respected, accepted in social circles for who they are, and can form great friendships.

"Amazing Grace" comes immediately to mind as a book which our family enjoyed. A bonus is the beautiful, compelling artwork! Very memorable.

Lists of books can be found online. For example, here is a list of Hispanic and Latino books: http://childrensbooks.about.com/od/culturalhispanic/tp/hispanic_latino.htm, a list of books featuring African American girls http://www.barnesandnoble.com/s/?category_id=980863, and more book lists can be found with a web search.

There are also the works of author Cheryl Willis Hudson and books by Sharon Draper.

ETA: blog by Dr. Joy Lawson Davis, crediting Dr. Rudine Sims Bishop with the concept of "mirror books" and "window books": Mirrors for reflecting one's own culture, and Windows for providing a glimpse into other cultures.

ETA: In real life...
Miss USA, 2016 - Deshauna Barber
Miss USA, 2017 - Kára McCullough, "[i]one of the most intelligent contestants in recent memory[/i]"