Okay so these last two weeks, the tank has been heated only by the UTH, I took the ceramic heater off. I added more foil onto the screen top, too.
The temp on the cool side is now 80-85 degrees and the cold side is a steady 75. She now sleeps on the warm side, and even hides behind her foliage during the day in the middle of the tank instead of sleeping in her cool hide. The humidity now holds at 60%, which is great since it only held at 50% for a few hours before I covered more of the screen.
I also asked my dad about getting a temp gun, and he's considering it!

And as a side note, when I ran out of fuzzies to feed her, I bought her fuzzies and one adult mouse, to see if she could take one. I used the 'widest part of the snake' rule. She took it on thursday with no problem! So after she consumes the other 3 fuzzies left, I'll permanently switch her to the adult mice!
If you have any more advice to offer, please do!