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