Will my rat ever bounce back from this?

I have two female rats, taco and izzy. Well, early this morning, around 4, I heard a loud crash and turned on the light. I guess they were being a little too rambunctious and they knocked down their wooden hut from the third level of their cage to the second. I wanted to make sure my rats weren't injured so I went to take them out of their cage, but only izzy came up to the door. Taco was on the bottom floor of the cage in the corner and when I touched her it startled her really bad. Once she realized it was me she crawled up my arm and onto my shoulder where she wanted to stay, so I just hel her close to me for about a half hour until she calmed down. She wasn't injured, just really shaken up. Now, it's 12:30, and izzy is up in the wooden hut on the thir floor and taco is in a cardboard tube on the bottom sleeping by herself! Now, what really worries me is that taco is hairless, so they've always cuddled up together in the wooden hut so I've never worried about taco wing cold... But my house is 65 degree right now. Is that too cold? Will taco ever go back to normal and play and sleep on the top level with her sis?she seems terrified of they hut now... I tried placing her next to it and she freaked out and ran back downstairs. Should I maybe buy a different house for them? I just want her to go back to normal so any tips will be greatly appreciated!