I think it would be helpful to know how old she is and is she eating ok? What do her poops look like? Is she moulting? Has she been sneezing or any froth in the corner of her eyes? Has she started laying eggs yet and if so, is that still happening?
I give mine some probiotic yoghurt and scrambled egg if they are looking a bit under the weather and keeping them warm certainly helps them when they are unwell at this time of year (northern hemisphere).
Hope it's nothing serious.