The two biggest issues she had was:
1) finder not easily acting as an image viewer. Eg, she had an SD card from her camera, and wanted to quickly scan through the photos and decide what to keep and what to throw away. The problem was that it took a while to find a view where finder showed images ( think it was called "icon view") and once we found that, it took a while to expose a hidden ui element that we could use to make the images larger.
2) "open file" dialog boxes don't show your home directory by default. She'd have a file in /Users/name/folder and the open file dialog would only show Documents, Pictures, etc, and not her home directory. I finally helped her make symlinks from folders that the file dialog deigned to show her to where she really wanted to go. But why is there no "home" view?