Sorry to hear about this....
But yes, age, how long has she been sick, have you always used this type of food, any other animals using it to with no symptoms, is there mold or bad smell in the feed bag?
If it is a food type issue, you will have to play and see what works for her. Until you know what is really going on , I would trow out that food and keep her issolated.
It may also be a vitamin defficeny issue also. So getting Poly-v-sol infant drops (WITHOUT IRON) and giving that for a few days to see if it helps.
Plz give us more info so we can best help you.
Best Wishes,
Laura