If she can keep something that is atleast 8-10 (or more) gallons, then she maybe able to keep a small species of frogfish. I'll respond to this if she can keep something as big as a 10 gal.
If she's limited to something like 3 gallons, I'd say get something like this
3 gallon pico tank. Put some smaller pieces of live rock, a few cheap zoa frags, some pulsing xenia, and a piece or two of display macro algae, and then add a pair of blood shrimp and 1 or 2 hermits for movement. Give her a gallon of RODI to keep at her desk to top the tank off at the end of each day (mark the tank with a sharpie to the "fill line"). Then have her do a 1 gallon w/c every week. The blood shrimp and hermits will be able to live on pellets, and the macro algae will help oxygenate the tank, as well as absorb some nutrients.
Here's one I found on Youtube
[video=youtube;hI0wvOLyfkQ]http://www.youtube.com/watch?v=hI0wvOLyfkQ&fmt=18[/video]