My black australorp had temporary slow crop issues as a chick. She is now a large, seemingly healthy pullet. Yesterday afternoon, I noticed her huge crop while all were out in the yard free-ranging...thought nothing of it. This morning, although they've been up a few hours with access to layer mash in the coop, when I let them out into the yard a few minutes ago, she's the only one with a huge crop. I picked her up, have her in my lap in fact, it is hard...feels like half a baseball. I am very gently massaging. She is behaving normally, and was at the grass, weeds and scratch with the rest this morning. But now I suspect she is just packing food on top of a blockage. Please advise...bread soaked in olive oil? I want to clear this thing as soon as possible to avoid souring or worse. Thank you in advance for your help.