You haven't given an idea of your budget, but I agree with the guys above, if she's a creative go with a Mac. I changed over about 7 years ago and wish i'd done is sooner - they really are so much better.
MacBooks are great. The MacBook Air or MacBook Pro are good if you can afford the extra but not necessary by any means. The basic MacBook is a great laptop and will certainly do for the needs of most people. If the budget allows go for the higher spec MacBook, then the Pro
1 final thought, if you're spending this kind of money, is it worth asking her what she wants or needs so you don't end up buying the wrong thing? I know it ruins the surprise if you do it before christmas, or you end up with nothing to give on christmas day, but you'd hate to spend over a grand on the wrong thing??? Just a thought.