Leo suggests contacting the school for requirements and what they prefer. The college store may have a good student discount, too. Since it's possible to run Windows on a Mac, he can't really go wrong with a Mac. It can run Windows natively from bootup. She could also run it in emulation (virtually), which slows it down a little bit, but not much. If she already has a Mac, she'll be fine. But Leo still recommends contacting the school.
A good Windows option is the Dell XPS 13. It has a great screen, and is the nicest Windows Machine Leo's ever used. He should get an i5 processor, with a larger SSD.