Can you repeat the warm saline eye compresses, just to keep the crust from forming? Terramycin eye ointment from the feed store (and I have even used plain triple antibiotic ointment in my chicken once) given twice a day may help the hen if there is a bacterial infection. Can you place her in a crate near the other chickens in order to see if she will eat and drink better? If you lose her or decide to cull, here is some info on necropsy in MO:
Missouri Department of Agriculture
Veterinary Diagnostic Laboratory P.O. Box 2510
701 North Miller Avenue
Springfield, MO 65802 Phone: (417) 895-6861
Fax: (417) 831-4766
Missouri Department of Agriculture
Animal Health Laboratory 216 El Mercado Plaza
Jefferson City, MO 65109 Phone: (573) 751-3460
Fax: (573) 751-5279
School of Veterinary Medicine
Veterinary Medical Diagnostic Laboratory University of Missouri
P.O. Box 6023
Columbia, MO 65205 Phone: (573) 882-6811
Fax: (573) 882-1411
Veterinary Diagnostic Laboratory P.O. Box 2510
701 North Miller Avenue
Springfield, MO 65802 Phone: (417) 895-6861
Fax: (417) 831-4766
Missouri Department of Agriculture
Animal Health Laboratory 216 El Mercado Plaza
Jefferson City, MO 65109 Phone: (573) 751-3460
Fax: (573) 751-5279
School of Veterinary Medicine
Veterinary Medical Diagnostic Laboratory University of Missouri
P.O. Box 6023
Columbia, MO 65205 Phone: (573) 882-6811
Fax: (573) 882-1411