I have a 1y/o Black Australorp hen who has about a baseball size crop impaction. It is fairly heavy and hard. She is eating and drinking fine. I noticed that she was lethargic a few weeks ago but didn't notice the crop enlargement then and she had snapped out of it a few days later. Never treated for this condition before. Not sure what to do..olive oil and massage??? It's large and fairly hard. TIA for help