An impacted crop is usually hard, so I'm guessing sour crop. The bone is normal. How long has her crop been full? Has it emptied at all, or has she pooped at all? Is there a sour smell coming from her mouth? For now isolate her from the other birds to lower her stress. If you really think it's sour crop, then massage her crop, and don't feed her anything for a day to see if it will empty a bit on its own. Do you give your hens grit? Sour crop is much better when it's prevented from happening in the first place. Giver her plenty of electrolyte water to try and flush some of that gunk out. Try to make her vomit by massaging her crop and tilting her head towards the floor (not upside down or she'll aspirate, just pretend she's a cup and you're gently spilling the water out of her mouth). Watch some videos on how to do this correctly so you don't hurt her. Give her breaks to breathe, too. You can try to get her to eat a little bit of coconut oil or apple cider vinegar so things move along more easily in her crop. The best thing to do though, of course, is bring her to a vet if you can. Sour crop can be hard to treat on your own.
