Hi, did you get another male recently? Last year you had two gliders, now three? When was the latest male introduced? About 5 months? It could very well be that she IS scared and being harassed by the two males. This can cause lots of stress and in turn she is expressing it in the only way she knows how. It would also explain the change in her eating... She may not be allowed near the food.
I'd recommend separating her if she's having issues with her cage mates. If you want to keep her, try spending more 'tent time' with her. It's about rebuilding trust, so it may take time.
Otherwise consider the adopting to someone knowledgeable who would sign a 'no breeding' contract.