I think daily support would be way too much. Typically I log on to my mother’s PC around once/month. I probably could get away with once every three months, but I like to keep her PC in pristine condition. And so it is.
If she wants to know how to do something that she can not figure out, I log on to her PC from Europe (she is in North America) and I take over her desktop (with the application ‘vnc’ ) such that she can see everything I do on her PC. We chat on the phone at the same time (each with a speaker phone) and I train her that way, and answer her questions. As you can likely guess, despite the training that is going on, over 70% of the conversation has nothing to do with Linux, but typically is about family, travels, and simply socializing.
I do all the security updates on her PC, and ensure her multimedia is kept up to first rate (which is easy because openSUSE with the Packman packagers has better multimedia support than any distribution I know of). Yes, debian based and Red Hat have good multimedia, but the Packman packagers tend to be a quicker off the mark with the various fixes/updates, and they are very responsive to help requests (IMHO).
Multimedia is important to her because of family videos, pictures, vcds, svcds, etc …
I think you are deluding yourself if you think there will be less maintenance with PCLinux or with Ubuntu.
With 2GB of RAM, you are no longer constrained to go for a small foot print Linux. IMHO go for a Linux distribution where you can get face to face support or remote support (such as I provide to my mother) from someone you can trust. IMHO that support should now be the defining criteria. If support from real people (not a forum) comes from PCLinux, then that would be my choice. If it comes from Ubuntu, then that would be my choice. Clearly in my mother’s case, she gets the best possible support with openSUSE (because of me remotely logging in ensure everything is in prime shape).
And if you can not get support from one real person that you know (face to face or remotely) then start looking at the forums, the chat channels, and see which one has the best community.
IMHO thats THE governing criteria, and anything else is lost in relative insignificance.
Some openSUSE support info:
Communicate - openSUSE