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How long has her behavior been going on? Egg binding doesn't usually cause symptoms like she's displaying. Two more likely things that come to mind are Marek's disease or a vitamin deficiency. Do you know if she was vaccinated for Marek's as a chick? Even vaccinated birds can get the disease, but knowing whether she was could still help us determine the problem better.
If not Marek's, a vitamin deficiency is possible. I'd isolate her from the rest of your flock and start giving her vitamins in her water or polyvisol infant vitamins (2-3 drops per day). Improvement may take a few days, or a few weeks.
Good luck with her!