Sounds like she may have bumblefoot. Here is a link to describe it.
http://www.poultry.allotment.org.uk/...t-chickens.php
Here is a blog that I found that describes home treatment.
http://backyardchickens.yuku.com/top...ggcentric.html
Good luck. Several years ago I had a Rooster we had to put down due to bumblefoot. Although he was not a pet to us so not upsetting to us to put him down.