Don't bother with a tablet. For that price, even the Surface RT with the keyboard is out of the price range. And a laptop will have much much much more functionality and convenience than a tablet. Better screen, bigger screen, more I/O, DVD burner, way better keyboard, more storage space, much faster, full Windows, etc etc.
The only downside of a laptop is slightly less "portability", but honestly who cares?
There's no way in hell a college student should limit themselves to just a tablet. Productivity will be really bad and I guarantee she will highly regret buying the thing.
This is the route I would go for that price range:
Yeah it's refurbished, but that's nothing to be worried about. You can save a ton of money this way.
It has a nice 15.6" screen, plenty of HDD space, modern i5 CPU, plenty of RAM. The only downside is that it has Windows 8, but you can probably downgrade it to Win7 if you want.
Honestly, that's a really good price for a laptop of those specs. Then use the leftover budget to buy a nice mouse.