Returning

[Ouch!]

Has she been updating BootCamp regularly? I've run into issues in the past where my Windows partition has difficulty with certain parts of the hardware because the BootCamp drivers aren't quite up to date yet. The Benchmark also doesn't run properly for ATI cards regardless (unless they've updated it since I last checked it out), so it's not a good indication for her system.

On another note, I'd like to point out that Miriel does not, in fact, have an eight-core processor. It's the 2.4 GHz quad-core processor with hyperthreading. Manufacturers try to pass hyperthreading off as a doubling the cores, but that's not really how it works. The six-core processor with hyperthreading is the best out there, but the lower end model would be an additional $1,500, so I sincerely doubt she shelled out for it. That's more technicality, though, as the quad-core with hyperthreading is more than sufficient anyway.

Looking around, it seems a month ago, the best graphics card offered might have been the 4870, which might be part of your problems if that's really what you're using (as of early August, they kicked it up to the 5XXX-series ATI cards). It should still run it, but you'll have to be careful. If it's only the 512GB model, you're in trouble since that's just barely minimum specs. I'd look into that. Updating the graphics card may be in order (although it will run you a pretty penny).