I pulled one photo from your other thread. That looks very much like it could be some lash material which could indicate that she might have Salpingitis.
@rebrascora what do you think?
You at first thought she may have been egg bound - I'm assuming there was some type of behavior she was exhibiting to make you think that. You dismissed this because you felt no egg. Hens that have reproductive disorders can have similar symptoms to egg binding.
The crop not emptying, the poop photos in your other thread and your report that she her bottom felt surprisingly full - to me, makes me think she has a reproductive problem.
The Oxytetracycline may help with inflammation and infection enough for you to be able to start getting the crop to clear. Eliminate any dairy or extra calcium (spinach included) while she is on the antibiotic. I believe it's one that calcium binds with and makes it less effective.
Work on the crop to see if you can get it to clear. The oil is a good place to start, massage 4-5times a day if possible. If it's not clearing in a couple of days, then give 1 stimulant free stool softener.
I understand you are throwing everything you have at her, but give the Corid, the antibiotics and dewormer time to work.
She didn't lose weight overnight, so she's not going to gain it overnight either. I would get some regular chick starter crumbles and make them into a wet mash. Scratch and peck is separate pieces and may be hard to digest.
If she is suffering from something like Salpingitis, she may improve for a short period of time with antibiotic treatment since that can help reduce inflammation and fight infection. Often times a crop issue is a symptom of an underlying condition or illness. Many hens that have reproductive problems also have crop issue due to swelling, inflammation and/or masses pressing upon the internal organs - this makes it hard for the digestive process to work properly.
Do the best you can and keep us posted.
Just my 2¢
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