EGADS.... How can people use Dell then suggest it??? You people make me sick! But seriously, I think Dell's are as good a computer and company the same way I regard the Hummer H3 as being the ultimate offroad weapon.
Macs are great, love em and use them. An entry level macbook will serve your purpose fine and you can get the best price on them by going to the apple store site and choosing "education" from the left hand navigation as she's a student. Alternatively you can click this link
http://store.apple.com/Catalog/Austr...utingpage.html
Sony's aren't bad they're just overpriced and I have moral objections to their company (due to them putting spyware on their cd's)
I haven't bought a Toshiba for a couple of years but I've always in the past used them and found them to be good - They just manage to always be a few kilos heavier than every other laptop around!