Baytril is not approved for poultry due to developing antibiotic resistant bacteria. But some vets still prescribe it for chickens who are in need of a strong antibiotic, but you should not use her eggs or meat. If you do still use her eggs, you should wait at least a month. It will treat MG, secondary E.coli infections, so it would,be up to you to use the Baytril. I would probably use it to see if I could save her life, but yor call. Your chicken looks very sick to me. Have you wormed your chickens recently? If she lives, I would also treat her for possible gapeworms with SafeGuard liquid goat wormer 1/4 ml per pound for 5 straight days.