I would probably get some Corid powder or liquid, and treat her for possible coccidiosis since she looks weak and puffed up. Recheck her crop at intervals, especially in early morning since it looks a bit full in her pictures, but when they stand hunched, it might just look that way. Crop impaction or sour crop, or even a gizzard blockage can make them weak and unable to eat. So many problems can affect chickens, so I hope you can help her. Check inside her vent an inch or so to check for a stuck egg. Try adding a lot of water to a small bowl of chicken feed, a tsp of plain yogurt, and a little raw or cooked egg together to tempt her to eat. Continue the NutriDrench at 3 ml per day.