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ANSWER: She can use either to enter the US. But I do not recommend doing that. Because if she comes as a visitor, and then she wants to become a student without leaving the US, she would have to file form I-539, Application to Change Nonimmigrant status from B to F. There is no way it will be processed by the time she wants to starts school, based on the timeline you describe. Therefore, the best option is for her to come to the US on the F1 student visa, 30 days prior to the start of school. She can travel and then start school when the time is right.
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