I'm not sure how much it will help but I dealt with a sour/impacted crop last year and thanks to some great people on BYC my hen recovered. I'll post the link to my thread.
https://www.backyardchickens.com/t/893065/please-help-i-think-my-hen-has-sour-crop
Chickenchick11. I'm so glad everything turned out good for Jackie. She's a sweetie. Love RIRs.