You will need to do a thorough exam of her foot and leg to see if you can find anything unusual. A limp can be caused by many things, including injury, leg mites, and infection (including bumblefoot). Here is a link to information on leg problems in chickens - maybe you will find something in here that will help you. Also, here is a list of questions at the beginning of this thread - if you answer them to give us more information you may get more responses from people on here who have experience with leg problems.
https://sites.google.com/a/larsencreek.com/chicken-orthopedics/leg-braces
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) How long has the bird been exhibiting symptoms?
4) Are other birds exhibiting the same symptoms?
5) Is there any bleeding, injury, broken bones or other sign of trauma.
6) What happened, if anything that you know of, that may have caused the situation.
7) What has the bird been eating and drinking, if at all.
8) How does the poop look? Normal? Bloody? Runny? etc.
9) What has been the treatment you have administered so far?
10 ) 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?
11) If you have a picture of the wound or condition, please post it. It may help.
12) Describe the housing/bedding in use
