That's good to hear.
The intention was never to keep her as a pet, just to make sure the cat bites didn't get infected and keep her inside for that one random week of 15 degree weather and ice covering the ground. I didn't realize they were that cold-tolerant, so I feel much better about releasing her now. I'll go ahead and start cooling her down by keeping her near the kitchen door for a few days; wouldn't want her to go from toasty reptile-room temps to being outside.
I've been thinking for about a week now that release would be best for her, but I was just worried because it would be a death sentence for many species at this time of year.

There are some very nice areas within an hour of where she was captured (that are much easier for me to get to than her exact capture site due to me having a truly insane schedule with no weekends). I'll start checking for the warmest days in the next week or so that I can release her.