Thank you thank you Everybody

The towel is a Very Temporary measure.
Going to go get appropriately sized R-carpet today.

She's only been in this enclosure for about 16 hours.
And I made sure to hold the mice well off the floor. She was climbing around on the grape vine (I think looking for prey...) and she hit them both about 6" off the floor, so I wasn't too worried.

She is currently curled up in the dark/warm corner, I think sleeping. Body curled, head/neck extended out a couple of inches.