I would drop the hot side temp, as when your substrate is paper, air gets between the tub and the paper and cools it off. Then when your snake lies on it, the paper heats back up since it's pressed tightly against the tub.
Missing one feeding for a three year old female is nothing, and many adult ball pythons back off feeding as we enter winter even if you keep their temps and humidity up. I have one female that hasn't eaten in three months.
When you switch enclosures it can take them several weeks to settle into it, so I'd give her more time in her tub. You should find it much easier to maintain than the tank.
Other than dropping the hot side temperature you could cover the long side and one of the short sites with some newspaper or a light towel to make her feel more secure.
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