My polish has been going through this. Have you tried worming her? I ended up having to give mine water with a dropper constantly. She would eat scrambled eggs.
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Can you possibly get her to a vet. With her so sick (she is in big trouble here and needs the right help fast) and you new to chickens (as we all were at some point), there may not be time for trial and error here....and as we all know from being sick at some point, 5 minutes sick can feel like an eternity
JJ