Pampered Hen...I get the name here...you're talking about Thyme, aren't you?! If she's not pampered, no one is! Anyway, I've been through the sour crop thing with my chicken. Fortunately, she responded pretty quickly. I noticed the squishy crop on Saturday but didn't know what it was. Then, when I found out, I brought her inside on Sunday morning and she was able to go back home on Thursday about noon. She responded to the wine treatment. I had caused her to vomit on Sunday and again on Monday a couple of times. Then, I read about the wine from upthecreek. I went to the grocery to get the wine and had a friend come over to help hold her. She finally "downed" about 3 cc on Tuesday afternoon. By Tuesday night, she "expelled" her poop so that it was like a minor spray across the bathroom floor. (That was a wonderful thing even though it was a mess.) I felt then that it had worked and for once, I was right. I started her on baby food, applesauce and yogurt. After 24 hours, I added very small amount of chick starter (1 tsp) to the applesauce. Wednesday was the same fare until about noon. I then put a tsp of her crumbles into the applesauce to get them soggy for her afternoon/evening feedings. (I fed her about every 3 hours up until 8 pm when it was "lights out so mama could rest!") She just kept getting better and better so on Thursday, back outside she went. That timing was good, too, because our very cold weather had taken a break and it was much warmer outside...instead of high in the upper 20's, it was in the low 50's. She didn't really have any relapses and I'm thankful for that.
I didn't go back through the posts to read whether or not you tried the wine. If you haven't, you may want to try it. If you can let her vomit as much as possible and then get 3 cc down her, then no other food for several hours to let the wine work. You will need someone to hold her and even with that, it is not easy. Put a little wine at a time into her mouth to let her swallow it. She won't like it but then, think cough syrup as a kid. We didn't like it, but it worked.
Your efforts for this special little bird is absolutely refreshing. The people who have worked with their birds and this problem are indeed my kind of people. These little creatures have feelings and can think. They also become part of the family! Hang in there. I'll keep following the posts to see how you're getting along. I don't know what else to offer as suggestion. I just hope that something finally kicks in for Thyme to return to her good health.