Personally, I would treat her with the Safeguard, you can find that at most feed stores.
Again, the crop not emptying is not good. A large and hard crop sounds like it may be impacted(?) do you feel a firmish mass in it? I would continue to massage the crop, offer some coconut oil and plenty of water. She can go 24hrs without food if need be so you can try to get the crop cleared. https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
http://www.backyardchickens.com/a/impacted-slow-and-sour-crops-prevention-and-treatments
After you get the crop cleared, offer her soft foods for several days so you can monitor the crop. Wet feed, hard boiled or scrambled eggs would be good. The whole time, see that she has plenty of water.
Again, the crop not emptying is not good. A large and hard crop sounds like it may be impacted(?) do you feel a firmish mass in it? I would continue to massage the crop, offer some coconut oil and plenty of water. She can go 24hrs without food if need be so you can try to get the crop cleared. https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
http://www.backyardchickens.com/a/impacted-slow-and-sour-crops-prevention-and-treatments
After you get the crop cleared, offer her soft foods for several days so you can monitor the crop. Wet feed, hard boiled or scrambled eggs would be good. The whole time, see that she has plenty of water.