My ball pythons all take hopper mice or fuzzy rats for their very first meal. Unless she weighs 30 grams, go with hoppers, nothing smaller. Some ball pythons will not eat prey that they judge to be too small. At 66 grams, she needs hoppers, not fuzzies or smaller.
She is the size of a newly hatched ball python, so I think your guess that she's not been eating is correct.
Absolutely stop handling until the snake is eating.
The most important thing is to get the snake eating. If it already looks thin, it's obviously not eaten in a while, and hatchlings don't have the bodily reserves to fast for long periods. You can't be sure how long she's gone without food already. I recommend reading up and using all the tricks used to get baby snakes to accept their first meal--for all you know, it will be her first meal.
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