My 9 month old female cat wont stop pooping in the sink. I had just one litter box placed and cleaned it every day and that was fine. Then we moved and she started taking a liking to the bathroom sink. So I added another box, putting this one in the bathroom, and used a lavender essential oil as a deterring scent in the sink. It worked for a couple days, and then she decided it was back to the sink. She has a clean bill of health, and her personality hasn't changed at all to hint otherwise. I have no idea what to do, and desperately need help because I live in a house with three other people who are losing their patience with her.