Bent Foot- Please help!

[Jacobt]

My 6 month old hen (speckled sussex) has developed "bent toes" in one of her feet. She walks on toes bent, and has been for about a month. She can't perch because of it, either. I've included some pictures. Does anyone know what is wrong or how to treat this? When she was younger she never had any issues with this.
Thank you!

 

[Eggcessive]

Does she limp or hold her wings out to help balance? Could she have injured her leg? Was she vaccinated for Mareks disease? Can you get some human vitamin B complex tablets that has riboflavin and other B’s on the label? Riboflavin (B2) deficiency can cause curled under toes. Usually it involves both feet. Mareks disease or an injury could cause this in one foot. Mareks also can cause numbness or paralysis in one or more extremity.