It can be injected if they have enough breast muscle, or if you know how to give injections under the skin, but it can also be given orally.
It is banned for use in poultry, but many people still use it and eat the eggs and meat of birds treated with it. I also mentioned Amikacin because it's not banned, though it's not cheap.
If she were mine I would get her in an 80-85 degree cage, tube fluids, and start Baytril. I'm pretty hard core and understand that this is more than most want to do, and I understand.