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Gobies would work. I like the clown gobies myself. lol
Or maybe a goby and pistol shrimp pair? They are very cool to watch. There might be some small blennies but she will be kinda limited as to how much fish she can add. 12g isn't very much space.
I had a 4g pico with a yellow clown goby and lots and lots of coral so a small tank can be done, just alot of work the smaller the tank so be prepared. lol
I would concentrate more on the coral and inverts if it were my tank. She can get a couple shrimp and some crabs, I have emerald crabs and they are really neat to watch. They do a little dance sometimes up against the front glass, it's hysterical. lol
Have you had her check this link for ideas? Check out the nanosection, it's pretty good and tells you alot of information about the fish as well.