Did the university admit other white students with her exact same gpa and sat? What extracurriculars did they have? How was her essay? What sports did she letter in? What community service project did she do? It's competitive, and yes, universities do look to admit a diverse freshman class. A white person took her spot.
3.8gpa, you're leaving some details out, IMO.
If she wants to go to an all-white school, try Liberty University.