Bec,
I too have a dog that is well trained, but I will never trust him around my chickens. You are right, a dog will be a dog, and it takes a matter of seconds.
I hope she makes it. Great advice here for treatments, thanks to all who shared. Learn more every time I read the posts. My chickens are pets. I would try everything possible, but I would also cull them if they were to the point of beyond any hope.
She is in good hands, and I hope for a speedy recovery.