Unregulated UTHs can burn the snake. BPS are kind of known for not moving off the heat pad even when it gets too hot :/. A thermostat is a necessity in BP keeping.
But that's a a safety issue and probably not related to her not eating. I agree that she probably feels too insecure in the large tank. Try cluttering it up with silk vines and other high-coverage tank decor. If that doesn't work, get a smaller tub and kept her in that for a while. You can even put the tub in her large tank, that way you can put it halfway over the heat pad so you don't need to buy extra supplies.
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