I understand that isolating a bird that big might be a problem for some people. If you go to firststatevetsupply's website, you will see that there are some antibiotics available in pill form. If you can't find what's appropriate, you can ask him.You can give the bird a pill in a treat and that is so easy, that way the whole flock is not getting meds that they might not need. Or, if you use injectable Tylan, especially if you can inject it under the skin, that is an easy way to inject, even for those who are worried about sticking a needle into their birds, and again, you're only treating one bird. That stuff can be pricey, but please bear in mind as I said bf that a little goes a long way and lasts a long time, especially if you're only treating one bird. We have two beautiful peacocks and I would be very worried if they got sick,so I'm sure you must be worried too about yours though it seems that she might be getting a bit better, I wouldn't take a chance.