Thanks for the update! Crop problems are difficult to diagnose as to why they are having trouble, so many reasons why a crop is slow to move.
Sounds like you are doing a great job with her! If she were my bird, I would definitely rule out everything I could by Worming her, using Corid for possible Coccidiosis, using the Baby Oil or Stool Softener for possible impaction and keeping her hydrated. When food isn't moving out of the crop or intestinal tract, yeast will develop. I have had great luck with Acidified Copper Sulfate to clear up all types of yeast infections chickens get. You might consider purchasing at some point, it's a wonderful thing to have on hand.
https://www.twincitypoultrysupplies.com/index.php?main_page=product_info&products_id=340
You can purchase Antibiotics (no prescription required) from this place as well.
Chickens heal slowly, I am glad to hear she is a tad better! Keep up with all you are doing, try to keep her hydrated as much as you can to help move this gunk through. If you are drizzling water in her mouth, go slow, keep her head level not back and drop into the front of the beak so she doesn't aspirate.
Keep us posted!