There are indeed sticky feet on the bottom of my terrarium!
She seems to have no problem roaming around the warm side of the tank, she just doesn't sleep there. I've seen her rest her head under the lamp a few times, though she's usually not awake when it's on anyway.
I'm wondering if she just likes the shape of the hide on the cool side. She sometimes picks a different hang-out spot after I've cleaned and re-arranged the tank. I might try swapping it around later and see how she responds.
I'll take everyone's advice and buy a heat gun. In the meantime, I will continue keeping an eye on my thermometers.
Guess I don't need to go any warmer. Thanks everyone!