I have had cats for years - all was fine until we got a second one and then the territory-marking began! I have tried every product out there and have had only very limited success - some cleaning products remove the color from the carpet. The urine often can stain/bleach the carpet anyway. My rug guys say 1/2 water and 1/2 vinegar, but I have found the results to be so-so. Sorry for your frustration - I would just say get it up quickly and perhaps put foil around the spot so when your cat tries to go in that area again, the crinkly noise will scare her away (hopefully to the litter box!) I love, love my cats, but.....