A friend of mine moved away and gave me her cat. The cat is extremely loving and all around wonderful except for one problem. She won't use the litter box. She will use it if it's brand new and hasn't been touched by another cat. As soon as my cat uses it she won't go near it even if it's cleaned. She's had a rough go of it: 4 homes before mine, declawed by pervious owners, and attacked by the cats of a pervious owner. I feel awful for her and want to keep her forever but it would be nice if I could keep my floors as well. Any suggestions on how to get her to use the box and save my rugs?