How big is she and how old? If she is over 1200 grams she may be building folicles...Most of the time when they start they spend most of their time on the cool side. If she is bigger, you may want to put a male in with her... I have had this happen over the years. Ill have a female that is around 1300 grams go off feed in breeding season. I usually only breed if they are over 1600, but if they go off feed i throw a male in. After locking up they eat like crazy. Sometimes you get eggs, sometimes it just gets them feeding again.