I’m not sure if that is a dropping or something else. She may be having some pain and feels bad. That can be common when hens are having reproductive disorders. Unfortunately, there isn’t a whole lot you can do other than give the calcium, and try to make her comfortable. Half of a low dose 81 mg aspirin once or twice a day might help some, but do nit give mire than 2 days. Some will try an antibiotic from a vet to treat infection, but many antibiotics are not approved for hens. Is a vet possible?