I was just doing some rearranging in my little torts enclosure. She was out roaming around, looking hungry (as she always does) So, I gave her a little cactus to munch on. She ate and started to roam around again and then she pooped. Before I got to it to clean it up, she turned around and ate some of it!!! Is that normal? I've never seen her do this before. Does this mean there is something lacking in here diet?