1. Cover 3 sides (except the front) with dark paper or foam board. This will help her feel secure. The constant roaming means she is stressed, it doesn't mean she is happy. A hiding BP is a happy BP.
2. Get a thermostat to control that UTH pronto! You can buy one online at reptile supply or reptile basics. They can get a little pricey, but if you don't have one, there is an extremely high risk that UTH can burn your snake.
3. Get DIGITAL thermometers with PROBES. So you can accurately measure your temps. Also, get something DIGITAL to measure humidity.
4. Get her another hide (preferably identical to the one she has) and place it on the other side of the tank with the water in the middle.
As for getting her to eat. Do you know how much she weighs? If she is around or heavier than 800 grams, I suspect that she might have gone off feed for the winter.
Wait one week, offer again. Wait one week, offer again. Eventually she will eat.
A few things you can try: Heat up the head of the mouse and then present it to her. Leave the mouse to thaw in the same room the snake is in. Leave the thawed mouse in the cage over night.
Hope this helps.