Hello, I am a brand new bunny owner to a Holland Lop bunny named Lacy. I currently have her in a pen cage that is pretty big. I heard that you can litter box train bunnies to make it easier to free roam them in the future and it is something that i wanted to try. However, now she just sits in the litter box all day. She doesn't leave the box. I can pick her up and move her outside the box and she looks around but then hops right back in. What should I do? Should I be concerned?