Yeah, my addition to what others have said is if her game shows up four times, she might have been using the save as function instead of regular save. Have you looked at all your save files and if you have, try going to:
My Documents (or just Documents on Vista, not sure what it is on a Mac) - Electronic Arts - The Sims 3 - Saves
Look at all the names and see if you can find yours. If you can, you may just have to recover the save, which the instructions have already been linked to in this thread. Hope this helps!