Do not retake the test. Her score indicates that she can do the work. Anything over 87% works for all the top tier BS and even students with lower scores have been accepted. How was her essay? It is about the whole package. I agree with others I. The forum. She should focus on her essays and application materials.
Many school use the test, along with grades, teacher recos and placement test to determine her math class level. As you can see even in this usage it is just one piece of the puzzle.
Good luck to her.