We have not seen her pecking at it. But did observe her scratching at it. She is separated in a dog crate in the coop. She appears to be drinking a lot. We put ACV and probiotics in the water. We are massaging the crop twice daily. We both work away from home so that is as often as we can do it. We just got her a little over a week ago. Prior to being with us I'm not sure exactly what she was eating but I think it was hen scratch. When she came to us we were finishing up some hen scratch and transitioning them to an all flock. They have access to feed and oyster shells all day with us. Previously, she and the other 9 we took in, were "hand fed" twice a day. They seemed to be pretty hungry when we got them and ate everything in sight, including some stale bread my chickens hadn't touched. They do free range with us during the day and were limited to a coop previously. We do have access to a vet, but would really prefer to treat ourselves or just put her down. It is improving since we noticed it on Sunday. We have vomited her the last two nights, tonight's substance was much less than last night's. She had been off solid food since Monday evening, tonight I gave her some finely cut up strawberries, bell peppers and boiled egg.I put some triple antibiotic ointment on the wound tonight
I would continue to do what you are doing. The ACV is debated by experts whether it is good or bad in crop problems, so I would skip it just in case. Clean water to drink, no whole grains but just mushy all flock feed mixed with lots of water. As you say, she may have been starving since she did not have access to food all the time, and has stuffed herself, but she may have been suffering from this even before you got her.