She was diagnosed with roundworms and coccidia and it was after I initiated treatment for those that the crop issue developed. Maybe coincidence.I'd treat the symptoms of sour and impacted crop according to the article.
Often there's an underlying condition that can cause the crop to slow.
You can try deworming and treating for Coccidiosis too - getting a fecal float to see if those are even part of the problem is best if possible.
Very often a laying hen has crop symptoms due to an underlying condition like cancer or reproductive disorders. Every hen I've ever treated that had crop symptoms had some type of reproductive problem as well. These problems were revealed during home necropsy.
I am treating for sour crop and impaction. I have experience clearing impaction but in this case I can’t feel any fibrous blockage.