Hadley was using her litter box/potty as an open nest, but I moved it last night when I changed her cage. I put a bunch of extra substrate and her toilet paper in the corner she was using as an open nest and put the potty in the corner she was weeing in rather than the litter box (with her used/scented substrate). We'll see how this works!
I think she actually likes the slight changes I made to her habitat last night because she was much more relaxed when I put her back in her fresh cage and didn't run around marking things
