The temperature of the rock in the box is really not that warm, which makes me wonder if I need a new heat pad. When I feel the pad it barely feels warm to me. Also, I need to remove the paper towels and use a washcloth or dishrag. The paper towels dry up too quickly.
The trick is to use something that holds moisture long enough to keep the chamber humid, but doesn't dry out too fast, or too slow and lead to mold/mildew.
I hope this works out as it gives her a nice humid place to hang out, but I don't have to provide humidity to the entire enclosure which can tend to amplify the stinkies.