If it shows some images, and not others, it may be a problem with images linked from a different site. Here's an idea -- have her try this on her Mozilla/Firefox browser:
On the top menu, select Tools => Options
Select "Web Features"
In the menu, there should be a block that says "Load Images". That block should be checked.
Now the important bit -- make sure the sub-block below, which says "for the originating site only" is NOT checked. (If that box is checked, any photos linked via another site won't appear.) See if that fixes her problem.