BPs don't need temps in the 90's. If the hot side is 90-95 and the "cool" side is 5 degrees less, that means she is stuck at at least 80 degrees at all times. That's pretty hot. These animals are captive bred. They've never been exposed to the hot African prairies/deserts/whatever. They don't NEED those hot temperatures. They're used to civilization and air conditioned buildings. I keep my cool side at 75-ish and the warm side at about 80. She goes back and forth and actually spends a lot of time on the cool side. I would drop the overall temps in your tub/tank. I think it's just too hot altogether.

Another factor might be the humidity. If the water bowl is on one side and she's wanting the humidity, she'd stay close to it. I keep my bowl exactly in the middle and half way over the heat pad. I've noticed that she'll favor the side with the bowl if I move it around. Especially during shed.

I'd make sure both hides are identical, and maybe put a towel over the tank/tub too if none of the other ideas help. Maybe she has a view of goings-on from the hot side, and wants to get away from it. Just a few thoughts.