Give her Electrolytes in her water and some ACV (apple Cider Vinegar) Keep her warm and Quaretined until she is well. check and see if the vet in your area will see a chicken, most won't.
if you can post pics, sometimes that helps people reading the forums identify the problem.
Give us the following information. The more you tell us, the better we will be able to help you.
1) What type of bird , age and weight.
2) What is the behavior, exactly.
3) Is there any bleeding, injury, broken bones or other sign of trauma.
4) What happened, if anything that you know of, that may have caused the situation?
5) What has the bird been eating and drinking, if at all.
6) How does the poop look? Normal? Bloody? Runny? etc.
7) What has been the treatment you have administered so far?
8) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet?
9) If you have a picture of the wound or condition, please post it. It may help.
10) Describe the housing/bedding in use
Remember that we are not veterinarians. We help based on our own research and experiences.
We cannot monitor the board 24/7, and therefore do not guarantee we can always help, much as we would wish to.
We should never be a replacement if real medical attention is required.
If your situation seems to require a trip to the vet, please do so. It is always a good idea to know of an avian vet in your area in case your situation is bad enough that we cannot help. We encourage you to visit the Reference Forum and read up there before you need the information.
https://www.backyardchickens.com/forum/viewtopic.php?id=8818
https://www.backyardchickens.com/forum/viewtopic.php?id=10845
https://www.backyardchickens.com/forum/viewtopic.php?id=12751