Sounds like your tub setup is good, but yes, 71 is too low for the cool side. You're aiming for somewhere around 80. Is there a warmer area of your house that you could put the tub?

85 is a bit high for humidity. I would try to get it down into the low 70s. How big are your holes? You may have to add more.

I would wait another 5-7 days to offer food again. Go ahead and feed her in her tub. Sometimes the stress of moving them into a new tub (I know she did it last time, it may have been a fluke) causes them to not eat. For best results, offer them in their home environment.