The video did work, thanks.
She has an apparent problem with the flow in which her legs operate normally. I can't see exactly the direction her legs are moving, but it seems they may be pointed inwards slightly which is causing her to almost stumble on them when she walks. That may be induced by a deficiency in niacin (B3), but could also indicate some sort of genetic limb deformity. Sadly, at her age, with either problem very little can be done to correct it as the bones have become set in place.
Supportive care can be provided, but won't cure the problem. Supportive care for leg problems may include adding B vitamins to her diet, ensuring her pen area is soft padded to reduce sores, and making sure she gets in water daily to relieve the weight off her legs, and to allow normal hygiene habits. An addition of flax seeds to birds diet may help reduce pain, and inflammation of the legs,.