I agree you should check her for a UTI first. If medical is ruled out and your dealing with behavioural I had a similiar problem with Emma. She went in my laundry and the carpet, etc. Turned out she didn't like the litter box (I'd purchased one of the automatic ones), once I switched her back she was fine. She also had the problem when her litter box was dirtier than normal. I had a really bad 2 weeks and pretty much just came home to sleep, and feed/water them. I'd scoop out the poo, but was using pine litter at the time and didn't get the chance to change it out. My fault and not normal for me, but she let me know. Once it was back to regular cleaning again she was happy to go in it. My moms cat didn't like the new litter she got her once. So if you've changed litter, boxes, anything even small it may be the problem. Change it back to whatever it used to be. If it still continues I'd keep her locked in a smaller room (bathroom maybe) for a couple of days, and see if she goes in the litter box. 1 day may not be enough, she may just hold it so it doesn't really help. I also agree that the enzyme cleaners work well. We purchased natures miracle, put it in our steamcleaner and used that as the carpet shampoo. No smell left at all.