If she checks out OK at the vet, consider what might be upsetting her-- anything new in the household, increased traffic around her litterbox so she doesn't feel safe there, another cat prowling outside the windows. I've known cats that don't want to use a "used" litterbox, or want the litter smoothed flat. (Hey, we all have our crochets too.) Check cat care websites for more advice. Don't give up on your furry kid! ... View related article.