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Here is what I would check as I do a necropsy... (not nessciarily in this order)
open crop to see contents. Fungal infections could be present here...
Palpate and feel for lumps in the lungs, liver and intestines and if possible atleast feel the kidneys.
inspect the liver for spots.
open the gizzard for anything unusual and to see if there was sufficient grit inside of it. also check the color on the tough inner membrane.
look at her ovaduct to see if she was laying eggs or if she had stopped laying.
I would be on the look out for any type of parasites of course as your looking.
Also, any dark spots on the carcass or organs
I would lastly take the heart and carefully cut it open. Since she wasnt bled out it will be hard to see if there was a bleeding disorder, but look at the cut sides of the heart muscle for white spots, which indicate strokes and blood not flowing properly when alive.
Also, think back to when she was alive, did she have swollen comb and wattles?
I think your mostly culprit would be a sour crop. Opening the crop will give you the most answers if it is such, plus a look at the gizzard will tell you how far into her body the infection might have spread.