I may do that tomorrow. I just wish I knew what I was looking for.
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If her crop was empty when you checked it first thing in the morning, it's unlikely she has a crop disorder causing her to feel unwell.
If she's losing lots of feathers, actively falling out like so many feathers from a torn open pillow, she very well could be molting if it's fall where you live.
Molt can make some chickens feel very unwell, lose their appetite, become weak and lethargic. I'm specially feeding four such hens currently. If this is the cause of your hen's weakness, you're definitely on the right track feeding egg, yogurt, Nutri-drench and probiotics. Other forms of high protein food can include canned mackerel and tofu.
There's always a chance of something more serious going on. Try the special feedings for now and see if that perks her up. If she continues to decline, we need to examine other possibilities such as a reproductive disorder or an infection.