I have a 3 1/2yr. old hen, BO. went broody last fall, sat for almost 2 months finally hatched 1 chick. found out later we had some parasites and cocci. Have medicated 3times for both got a clean bill of health from the vet. All look good but the 1 BO. hen She is skin & bone. eats and drinks well. If I bring her scrambled egg or any special treat, she eats like she is starving. but does not gain weight. any suggestions on what the problem may be?