I'm sorry that your question wasn't answered in a timely manner. We don't have many avian vets on this site. Please see here for a review of egg binding: http://www.backyardchickens.com/a/egg-binding-symptoms-treatment-and-prevention/ You haven't mentioned the typical symptoms of that problem. Instead, she has become anorexic. Are there any other symptoms you can report to me - conjunctivitis, facial swelling, sneezing nasal discharge, coughing, regurgitation/vomiting, increased respiratory rate, diarrhea...?
In avian medicine, there's rarely one cause of a condition, so we usually begin with a list of differential diagnoses and use lab tests, X-rays, and physical exams to differentiate one from another. With this in mind, your best course of action is to reach out to your county-extension poultry personnel or avian-oriented veterinarian (please see here: www.aav.org) for help in differentiating the various causes of what you're seeing. Veterinarians can perform a physical exam and run diagnostic tests, including X-rays, to distinguish between the various differential diagnoses.
It's best to approach the diagnostic process with a clear sense Vanilla's financial value to your operation. Although some services such as your county animal disease diagnostic laboratory might be available free of charge through a county agency or land-grant extension office, the expense of some diagnostic tests and treatments can add up quickly. While it’s always worth your time and money to identify a bacterial or viral infection that could potentially impact more than one member of the flock, this might not be the case with a condition that only affects one hen.
Please respond with additional information and further questions or concerns.