If you have the under tank heater, you should have some sort of control on it, so it doesn't overheat. A thermostat, or at least a dimmer would be good.
Ball pythons generally LIKE cramped spots, so a second hide now with the water in the middle would be good too. Of course, if you're getting the 20L really soon, then I'm sure she'll be fine until then.
Are your temps and humidity good? If so, then you should be fine, but I'd definitely try to get a thermostat, to prevent the heater from over-heating accidentally.
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