After watching the Windows 8 video, I think it's fairly safe to assume, she won't be using windows 8 (cartoony and childish)
the windows version 1(microsoft executive) video was cool to watch too
I actually watched quite a few of these videos, and got the impression that this young man is just carrying out an experiment using his mum as a lab rat (sorry Diana).
He's trying to find out which OS is easiest and most logical to use for a user (non tech).
He has a pre determined set of tasks, which he asks his mum to perform in each OS.
And asks her for her thoughts and opinions on each one.
Whether the young man is biased or not, I think the overall idea is good.