I would agree that it looks like an impacted crop. I would isolate her into a cage so that she does not have access to food or bedding and initially just offer water or a very runny slurry made with pellets/crumble and water. Massage the crop for 10-15 mins 4 times a day if you can. Most chickens with an impaction will enjoy their crop being massaged, so if she appears uncomfortable you are either being too rough and need to ease off a bit or there is another issue. Better to start gentle and get firmer and be guided by her response. Once the crop is empty on a morning, then you can start to add a little more feed to her slurry to make it firmer but I would wait 3 days after her crop emptying completely overnight before giving her access to dry food again or more lumpy food like scratch or vegetation which needs breaking down. Impactions can occur as a result of food or water running out. Without food, they will sometimes eat bedding which forms a knotted mass in the crop, preventing food from passing. Lack of water means the dry pellets will form a hard mass in the crop. Some people experience problems with chickens eating hay bedding or alfalfa, particularly in winter when they don't have access to any greenery. Short chopped lengths are not a problem but anything over an inch or two long has the potential to clog them up.
Good luck with your girl.
Good luck with your girl.