Without trying to sound harsh, you don't know exactly what she wants. They require the cool side to thermoregulate which is fair enough, she's chosen that side. But you as an owner can't read that she wants the temperatures this low. It's just not healthy. If you put the temperatures back to normal she still has her choice. Some snakes just pick a favorite side, but you can't keep lowering the temperatures to try force her to the warm side.