Tut,
Depending on how much "office" like stuff she plans on doing on it, the new Samsung Chromebook is worth considering. It beats the iPads in terms of web browser performance, has a proper keyboard/touch pad so form filling and general editing/typing work is much easier.
I just bought one to play with and I am generally impressed.
Of course Google docs is not Microsoft Office, so if you need the heavy weight features of office you need to step up to something like the air or similar ultra-books and run OS-X or Windows and install real Microsoft Office.
Google docs works well enough for what I need it for, but that's not much as I don't do multi-media presentations, etc.
Cheers,
Robin
ETA one major benefit is zero-maintenance/support - if it breaks, just buy a new one, and you'll never have to worry about software installs, etc. They cost 229 from John Lewis with 2 year warranty, though I got mine from Amazon as JL were out-of-stock (predictably they came into stock as soon as I ordered from Amazon

).