Just let het regulate her body temp. She knows when she needs more warmth. Don't get overly concerned about this. What are the conditions in the room like? How cold is the cold side vs the hot side? I've had my little guy spend several days on the cold side (I think) just because he liked the hide on that side better than the hide on the warm side. If she's in shed just make sure temps & humidity are good and she'll be fine.