Check her crop first thing in the morning before she has access to food or water. It should be empty and flat. If not smell for a sour or rotten odor. An impacted or sour crop can be hard to treat. Here is a good article about crop problems:
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
	
		
			
		
		
	
				
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