Do you have pictures? 64 grams is hatchling size. So either they were wrong about her age, or she wasn't eating enough, or at all for them. What is her set up like? Husbandry can have a lot to do with balls eating or not. Also, are you handling her? If so, don't. Leave her alone to settle in, and once she starts eating then handle. You could try a mouse hopper. The action might peak her interest.
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