she couldn't afford anything more than about $350 (Canadian). ... With this criteria there seemed to be four possible options: an Android tablet, a Windows 8 tablet, a Chromebook, or a full-fledged Windows 8 notebook.
Doesn't an iPad Mini meet the criteria as much as a Win 8 tablet (albeit it is slightly out of the price range). Any Win8 tablet in that range is going to be 7" or 8" as well, especially if "Win 8" does not include RT.
I am not saying that it is a better option than a Notebook, but why not consider it?