Mareks disease can cause wing, leg and foot paralysis, and later tumors in the body. Here are links for help with leg problems including splay leg treatment using vet wrap as well as Mareks disease:
http://partnersah.vet.cornell.edu/avian-atlas/search/disease/502...
Can you show a close-up of her standing from the front, and give a little more information? Is one leg turned out to the side, is she sitting on her elbows, or does she have toes curled into a claw? Those are some common problems. How old?