First, I would bump her night time temp up. 82 is way to cool. They are night creatures, so this is the time they are really looking for a warm spot to settle into.
Second, I would get a scale to monitor her weight. That way you know for sure how much she is loosing instead of eyeballing it. It will be much more accurate.
Third, I would get a frozen thawed rat, warm it up really nice, and leave it on her warm side all night.
I had a girl who just broke a 9 month fast, and has eaten two big frozen rats in two weeks! Assist feeding should only be a last resort, after you have tried everything and it's life or death.
Is she sleeping during the day? Or, out roaming a lot?