The spots that appear on her photos are from dust or dirt specks on the sensor. Actually, the sensor has a clear protective glass coering. I use a bulb blower periodically to get rid of most of the spots. I've got a Copperhill cleaning kit, which uses the fluid and swabs, but haven't had to resort to that in 3 years using my Nikon D70.
When cleaning the sensor, whether with blower or swabs, the camera needs to be held with the lens opening down. Also make sure the battery is fully charged as bad things can happen if the mirror is locked in the up position and you lose power, or so I'm told.
Here's a site with links to the various cleaning methods.
http://www.cleaningdigitalcameras.com/
Hope this helps,
Dick