The temperature gradient sounds about right. As long as she's eating and doesn't seem stressed, your setup should be fine. It sounds like if she's using both hides she's thermoregulating just fine. One thing I was thinking, you said glass, do you have her in an aquarium with a screen top? With that you may need to cover a portion of the top to keep humidity in. Of course you may know this and have it taken care of already, but figured I'd say something in case you need help with that.
Oh, one other question, when you say hot probe, do you mean the thermometer or thermostat probe?