My 3 year old female spayed cat has for the past 5 months taken to peeing on my bed, the sofa, plastic bags, sofa pillows, or clothes left on chairs, or anything else she can pee on. She has a Litter-Maid litter box which is self cleaning and I clean it weekly, and she always uses it for solid wastes. I am at my wit's end. She was declawed when I got her, so I can't put her outside. Any Suggestions?