This is where Kiddo's been living for the past few days. After what happened to her sister, we went this route. It's a fishtank with a modified lid. We put some screen (the kind for window screens) on top of the tank, and then fit the plastic brace on top of it. The plastic brace is what you usually put the filter and stuff on.
So this is where she stays. She is all alone in the bathroom now (where it's warmer).
Here it is:
From bottom to top is: a towel, her rice bag (heated dry rice to keep her warm), another towel, Kiddo and her beanie baby dog, yet another towel. LOL! So that's why it looks pretty full in there.

But she is comfy, and we always leave her a space to get out from underneath her top towel and crawl out.