Its not dead you might try misting her with plain water twice a day for a couple of days. She won't get very big because she'll spend part of her growth time recovering but you should be able to get something off her. What kind of heater are you using? I am not nearly as cold as you are but we usually get a nights that are in the 40s and usually a couple of weeks of night freeze so I debate on getting one for my gh. I would think in an enclosed place like a closet one of those portable radiator types would work best. You can't heat the room itself?