Some folks crop/tube feed sick birds.  The article may be helpful. 
https://www.backyardchickens.com/articles/crop-feeding.75454/
Painted Calls posted a video of how she tube feeds, it's here:
https://www.backyardchickens.com/threads/need-to-tube-severely-molting-hen.1437023/post-23839502
And lastly, there's Torpedo Feeding - tutorial and video is in this thread.
https://www.backyardchickens.com/th...eeding-what-is-it-and-when-to-use-it.1532744/
But, you may be able to entice her to eat wet soupy feed on her own.
If she's really weak, then extra protein may help - bits of egg, sardines, etc. are sometimes interesting.
	
		
			
		
		
	
				
			https://www.backyardchickens.com/articles/crop-feeding.75454/
Painted Calls posted a video of how she tube feeds, it's here:
https://www.backyardchickens.com/threads/need-to-tube-severely-molting-hen.1437023/post-23839502
And lastly, there's Torpedo Feeding - tutorial and video is in this thread.
https://www.backyardchickens.com/th...eeding-what-is-it-and-when-to-use-it.1532744/
But, you may be able to entice her to eat wet soupy feed on her own.
If she's really weak, then extra protein may help - bits of egg, sardines, etc. are sometimes interesting.
 
	 
 
		 
			
		
		
		
	
	
			
		 
			
		
		
		
	
	
			
		 
			
		
		
		
	
	
			
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		