My girl is sick again she is not out and about with the others. I noticed she had feathers coming in but today she is pooping watery yellow and that can't be good. She is eating and drinking a little. Crop is fine breath ok for a chicken I suppose. Her stomach feels firm, not supple. I gave her a soak, no bugs, 600 mg calcium and a dose of poultry vitamins. She is 4 and lays off and on. Would this be internal - age or a parasite problem?