You might want to read more about treatment for crop impaction.She had the crop issue back in December it went away and now it's come back
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
And as @nuthatched already suggested, stop the bread, corn and other treats and switch to unmedicated chick starter or all flock feed which will be easier fir her to digest.
Always make sure that she has granite grit available to help with digestion.