I put a litter box with hay in my rabbit's cage last week, and I'm having a problem. She poops everywhere except her litter box. There are poops and wet spots all over the rest of her cage, but she doesn't poop in her litter box. She spends most of her time in her box. Even when I make the rest of the cage spotless and put some of her poop in the box, she still doesn't recognize it as a place she's supposed to use as a bathroom. What did I do wrong?