I hope this gives you some positive insight.

My little pastel got out in November and was gone for exactly a week.
She too was covered in cobwebs. I assume the room temps were about 65 and she didn't develop any RI (thankfully). I put her back into her tub and that was that. And its funny because she ended a hunger strike after she came back.

It's definitely warmer now than it was back in November, so that's a good sign already.
Just like the others have said, bump up your temperature as a precaution.