She was trained as a kitten to use the litterbox, however although she will get into the litterbox and scratch, she prefers to use the tub. We've tried putting the litterbox in the tub, but although she will scratch in it and sometimes use it, she seems to prefer not to. She seems very interested in the toilet. Is it possible that she is trying to copy us? Would it be beneficial to use the kit that is designed to train the cat to use the toilet?