Well if the swelling isn't going down on its own you may have to empty it for her. You can try massaging it down (be careful if the stuff comes up, let her clear it out so she can breathe)or you can turn her upside down and squeeze it out. Just a little at a time, very quickly, then right her, so she doesn't choke on it. If you leave the stuff in her, it can sour and cause gas, which will enlarge the crop and be uncomfortable. After emptying, I would try a little mineral oil and work it around in the crop possibly feeling for the obstruction and trying to break it up. Of course, this doesn't always work. I've been working on a young bird for over a week now, trying everything, and nothing is working. I'm afraid her obstruction is farther down, not in the crop. She is very skinny and I am going to have to put her down. I have another young cockeral that is developing a big crop and I can feel the obstruction in his. Feels like a wad of string. Probably hay from his pen. I think I'm going to have to do the crop operation on him. Good luck with your hens. I'm off to look up the operating procedure.