We just got her computer back from the Apple Store again. This time the Genius got feedback from Apple that it was aware of the problem and is working on it.
I hope it lets me know so that when the fix comes, I can fix her resolution.
One of the things the Genius did was reinstall Lion, so we had to restore. I booted up, and it wanted me to select her MacIntosh disk as the source disk. No way was I going to risk overwriting her Time Machine disk with her Mac's drive. So I phoned for help, and was given a computer that didn't understand what I wanted, and finally a person who needed to know her serial number. My eyes aren't good enough to read the serial number on the bottom of the stand, and without the restore working, I couldn't get it via software. So I went to the Apple Store, and they said the message was misleading.
At any rate, when I got home, I did a safer solution, I held option down and booted into my recovery disk. This time the instructions for restoring were unambiguous, and her computer is restoring now.