She is quite comfortable with it. What was interesting is that this is the first computer she has really used. Most people I know started on Mac or Windows then saw Linux. She is the only person I know that started on Ubuntu.
For emergencies I keep extra boot-able OS partitions including the original Windows XP that came with the machine. When I show it to her she thinks Windows is not very easy to use and looks clunky. That always make me laugh.
I sometimes wonder about all the Geeks and hackers out there running Linux/BSD whatever and their kids/wives. Is there a waiting boom of non-windows educated kids about to break on the scene?
The first thing she said upon logging in to the guest acct was, "Linux is FUGLY!", but I think she's started liking the fact that it boots quickly and can do everything she needs with OpenOffice, evince, Skype, &c. While she is not particularly committed to FOSS, after this trip away from home without Win she has come to see the light. To ease the transition I installed Chrome, added all her contacts to Pidgin/Jabber (all her old friends from the Philippines use Yahoo! products) and I don't think she misses WinXPProSP3 at all.
For a lot of people (and businesses), that is a blocker. I managed to get a UVC webcam, but still had to get a PPA v4l repository and build some drivers.
I think it is good that ipods will be supported out-of-the-box in Lucid (Rhythmbox). The same should happen for Skype.
On that front, one should get rid of all the useless games and instead have : 1. a nice Twitter app 2.Scrivener-like app
These are killer apps for a lot of people who use a Mac - especially the young student demographic.
She is 66 years of age and doesn't know know much about computers. She started learning to use it a few years back to keep in touch with me over email. Her use case is primarily email, google, bank accounts and sometimes facebook.
I think Ubuntu UI is nice and clean. It doesn't confuses someone like her. Updates also work very well. It also work quite well for a command line user like me :-)