That's the good thing about getting a necropsy, it can save a lot of worry if it's not Mareks. If she has Mareks, then they have been exposed, but may or may not get the disease. Hopefully, it is not that. I would give some concentrated Corid to her in case she hasn't taken enough, and continue...
You can incinerate a carcass, which is probably the best thing when an infectious disease is suspected. I have had one die during a snowstorm, and just placed the body far away from my chicken area, and the turkey buzzards took care of the remains. When you speak to the state vet, you might say...
In a quart of water you can add a pinch of salt, and almost a teaspoonful of sugar to make some homemade electrolytes. Here is a recipe below for a complete mix:
HOMEMADE ELECTROLYTE SOLUTION divide this by 4 to make a quart of solution
1/2 teaspoon salt substitute (this is potassium)
1...
Mareks disease may be a possibility if she is eating and drinking. The food and water need to be placed near her. Maybe the other family members can check on her often while you are working. There are vitamin deficiencies that can also cause problems. There is a disease called botulism that can...
How old is she? I would get some vitamins with electrolytes to give her by dipping her beak into water, offering her a small cup, or giving a few drops at a time with a dropper. Dehydration could definitely be a problem, but it could be other problems such as Mareks, or another disease. Has she...