I KNOW I KNOW I KNOW! *raising hand*

This is so timely because I was just at Petsmart and they have a HEATED cat bed! I think it's only $19.99. It's a normal fleece bed with sides and it has a heating pad inside. If you could put that inside a box that she could be protected in, perhaps out of plywood or something, and run an extension cord out there, that would help a lot I bet. I have a friend taking care of an outside cat and she made a little house for him from wood and put a heating pad in it, he loves it. Hope that helps, I would be worried too, let us know how it goes!