I'm sure the bowl is getting lower because she's drinking. They don't roam around all night, and the young ones seem to stay in their hide longer than the adults. They usually come out about an hour after sunset, get a drink, and stretch their imaginary legs for an hour or two before going back to bed. I'm not sure how long you've had her, but if its been a couple of weeks it is perfectly okay to take her out of her hide and handle her a few minutes a couple times a week. She'll eventually realize that you don't want to eat her and will probably start exploring a little more.