Egg bound? Sour crop? Not sure

[atuna]

Have a hen that stays in the upright position all day in one spot, very weak balance, when attempting to walk. Diarrhea. Not eating, not drinking. Has not laid any eggs in about 3 weeks, that is when I got her. She was fine, energy was good, eating, drinking. Then all of a sudden a drop these last 3/4 days. When doing a check she was infested with lice, used Pretherin and DE to get that all cleared up. Now she doesn’t have any lice on her at all. But no improvement. I’m providing syringes of water, apple cider vinegar, yogurt, and force feeding small pieces of garlic. Not sure of what else to do? Here is a photo of how she stays all day.