installing and running a program might be too much for her.
You said might - and if you are going to be her remote IT go to person, you might want to guide her to install teamviewer (or something similar) so you can log onto her system remotely.
It is a free download and use at teamviewer. I have used this with my father-in-law and it was far easier than driving two hours if I really did not have to.
From Teamviewer website:
Control computers remotely via the internet, as if you were sitting right in front of them. Whether you are providing spontaneous support, administering servers or working from your home office, TeamViewer lets you get the job done.
Now you can poke around, install CPUZ and get the RAM data you are looking for.
This can also be handy if some other issue comes up down the road that "guiding over the phone" just won't help.