I actually can't believe how she ended up buying the Ubuntu PC. Dell has made sufficiently difficult for that Laptop to be traced and even then they ask whether you are sure with Ubuntu or want Windows.
Personally as a Linux user, I feel the "blame" should go to the representative who said "ubuntu is great, etc." Linux is great, particularly Ubuntu yes, but he/she should have warned the girl about pitfalls as well (such as no native MS Office 07, etc.).
Also I think the girl is not clever at all. Couldn't she just purchase a retail copy of Vista Home Basic + MS Office Home and Office?
I think it's more of her mistake really.