3 days is a long time to go without food for a bird.  They have very high metabolisms.  It does depend on whether or not she's drinking as well as how much she had in fat reserves.  I would guess 3 days to a week, but I don't have any experience with how long it take for a quail to starve.
	
		
			
		
		
	
				
			
	
 
		
		
	
	