What is wrong with this hen?
How old is she? Is that blood in her droppings or does it look more like intestinal shed? Her droppings look runny and yellow. Cocciciosis might be a problem, but it would be good to share a few more details about how well she is eating, drinking, and anything else. Corid (amprollium) is a good treatment for coccidiosis. Dosage is 2 tsp of the liquid, or 1 1/2 tsp of the powder per gallon of water for 5 days.