@Hholly has given you a good advice and I agree need  feed her a balanced chicken food, the fancy scratch should be used as a treat and not as a complete food.
I also agree that she needs liquids.
 
 
I apologize if I sounded abrupt or accusatory  earlier, because that is definitely not my intent. I usually look to see if  an OP has any previous threads about chicken health/injury, etc. Sometimes that may give a clue as to what may be happening with their flock and assist in helping find a solution. When I saw that you had a chicken die within the last 3wks or so, I was concerned that you may have an illness that could possibly be spreading through your flock. I was trying to determine if the hen that is now sick, has the same symptoms that the one that died had.
 
I do wish you well and hope she improves soon. Please keep us updated.