Ok, I just adopted a 3 year old spayed female cat from the SPCA, she was found as a stray. I did have her litter box in the downstairs bath which I showed her, but in the middle of the night she did her business in the upstairs bath tub. So I moved the box into my bedroom, which is right beside the upstairs bathroom. She went again in the tub after I cleaned it and showed her where her box is. Is it possible that she's just stressed and adjusting...I'm scared that she won't learn to use the litter box and I'll have to take her back to the SPCA. It did have a lid on it, but I have taken that off thinking that might help. Please help!