Firt thing turn the heat off right away, super warm temps will kill a rodent. I keep all of my breeders at about 65 year around. Also put some aspen bedding in with her and she will make a little nest. Since you only have the one you can pick up some mouse food from your local pet shop, lettuce is nothing but water and have no nutritional valuse but the carrots are good. Make sure your dog food does not have any red dye in it as it is bad for the snake and the mouse cannot excrete it.. Hope this helps,
-Matt