Sorry your bird is having difficulty in the crop. From your description, it does not sound impacted to me, but doughy. A doughy crop is a type of yeast infection. A doughy crop will be very hard first thing in the morning because the yeast have soaked up all the liquids in the crop. If you hydrate the crop, it will be come soft and doughy like, as if you could knead it like bread. An impacted crop stays hard no matter how much liquid is added.
So all this said, you might get her started on Acidified Copper Sulfate. Do not use any old Copper Sulfate but those labeled for Poultry only. You can get this stuff at Twin Cities Poultry. They ship everything priority mail within 24 hours of ordering...
https://www.twincitypoultrysupplies.com/store/index.php?main_page=product_info&products_id=340
It is mixed 1/4 teaspoon Copper per gallon of water. You can mix up a gallon and work off this for a couple of days. Give her a fresh mix every day for 7 days. After treatment she will need probiotics for several days to replace all the good bacteria and digestive yeasts.
If she is not separated, you can if you wish, dose the entire flock. Copper Sulfate is not an antibiotic, it is used in all animal feeds as a source of Copper. However in this case, you are going to give them more which will kill off all yeasts and other nasties in the crop and intestines.
Good luck and keep us posted!