actually, before you posted i solved the problem myself. i just forgot to post again.
it turned out i had a mod conflict, i can't remember what exactly. i just ran the hack conflict finder program i got from simwardrobe.com, and i deleted some files that were conflicting.
if you still talk to the person who still has that problem, tell her to run the program over at simwardrobe.com and delete any possibly conflicting files. that and, i moved my sims out of their house into another one. (afterwords) my problem stopped completely.