You might consider tube feeding her. There is a great guide on how to do this if you search up tube feeding in the search on this forum. You can even use a clean fish air pump hose as the tube in a pinch if you can't find a tube. Tube feeding her will help her get her fluids and nutrition.i like to use a food called Exact by kaytee for tube feeding as it does not clog and is nutritionally complete. As for the nature of her illness more clues need to be given to make a diagnosis. How is her breathing? Any wheeze or tail bobbing up and down when she breathes? How is her poo? Color and consistency? Any mucus or sneezing? Is her crop emptying? Any coughing. How do her eyes look? Is she puffed up ruffled feathers and sleepy? Look listen and feel her body for any more clues you can give us. Then perhaps we can find out the nature of her illness. I wish you the best. Hope this helps.