I agree with Kathy that getting her tested for MG would be beneficial for you to know whether or not she or the other birds could be carriers. Since she started out with bruising around the eye, it could be an injury. Call your state vet and ask how to go about getting tested. The steroid eye drops may be expensive since most any eye drops are just outrageously priced, but they could help her. I also wouldn't worry about what medicines the vet gives, because almost any drug has an egg withdrawal time. If it turns out to be mycoplasma, the organism can only survive in the environment (on feeders, waterers, on your shoes, clothes, in the soil) for only 3 days maximum. So if you just do a thorough cleaning and disinfection of equipment, you will be free of it. Then I would wait a few weeks for good measure. Here is a link to read about that:
http://edis.ifas.ufl.edu/ps034
http://umaine.edu/livestock/poultry/mycoplasma-gallisepticum-faq/
http://edis.ifas.ufl.edu/ps034
http://umaine.edu/livestock/poultry/mycoplasma-gallisepticum-faq/