I think you should take her to the doctor. If her poo is runny then she may have digestive problems. They can probably take a stool sample and pin down the problem.  
If it is a sensitive stomach there are lots of alternative food. I can tell more about that later if that is the case.
	
		
			
		
		
	
				
			If it is a sensitive stomach there are lots of alternative food. I can tell more about that later if that is the case.
	
	
	