Whether she needs Office or not depends on her. You can get the educational version of Office for Mac or PC for about $150, and it includes multiple installations.
The price on Autocad is pretty impressive. Four grand for the full version or $160 for a student version that expires in fourteen months.
While AutoCAD is probably the best CAD program out there for generalized purposes, perhaps the AutoCAD people are a bit biased in what they have to say on their web site about competitor's products on a competing platform? ;^)>
Check Reply #71 for a far from comprehensive list of CAD programs for the Mac.