I worked for Best Buy for 2 years.
The best thing about their business is the return policy. If she doesn't like it, she can return it within 2 weeks with no restocking fee.
Just don't let her buy the Best Buy service plan (PSP). It's a total ripoff for Apple products. If she wants an extended warranty, have her buy AppleCare from apple.com/store.
Best Buy doesn't honour the student iPod discount program, but they might have a promotion going on right now, depending on where you're located.
DONT let her buy a printer cable or any small accessory like that. Just grab the computer and leave. Don't let the idiot salesperson talk to you for a split second about their service plan, it's a total ripoff and won't help you in the least if you have a problem. Trust me, I was an idiot salesperson for Best Buy.