Is she losing weight? If she isn't, I wouldn't worry too much. Just keep offering normally. Balls can go off feed not matter what the age.
What sort of enclosure is she in?
Does she have hides? She could be stressed.
You may want to raise your cool side up a little more and lower your hot side. My babies tend to thrive between 88-91. I've had a few stop eating once it got hotter than that. But I guess it just really depends between different individuals, environments, and keepers.
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