I know she is not technically savvy, but having a PDF reader would be handy in case she finds something online she wants to read and it turns out to be a .pdf file.
Also, always helpful to pre-install things like WinRAR and such - Perhaps not for her, but as an aid to anybody who may need to run repairs on the machine or fix something for her (The amount of time I needed to download a file on somebodies PC only to find out they don't have WinRAR, making me take that extra step...)
Also, some pre-configured anti-malware/anti-virus software would be very handy, as well as having Chrome/Firefox the default OS with AdBlockPro (Old people click ads and fill their computers with crap) + McAfee Secure Site Advisor (This will warn you if you are going to a site that has proven itself to be questionable) And any other helpful addons you can think of.
If it is somebody you know personally and don't mind fixing her PC...then maybe a background copy of Teamviewer that you setup for permanent remote access (installed as a service) - That way, if the PC is on, and connected to the internet, then you can login remotely to fix any little issues (Or update Flash cause it has told her to do it, and she doesn't quite know how)
