If using vitamins, I would use a chicken multivitamin that contains riboflavin and other B’s. There are many brands a ailable at feed stores. A Human B complex tablet can instead be crushed onto some food daily.
Chickens slings are helpful to get them up and out of their waste, and where they...
Mareks disease comes to mind with limping, then some improvement, then being totally lame later, but I am not an expert on Mareks. Has she been feather picked by other chickens, or being over-mated by a rooster? Are your roosts very high that she may be injuring herself? Has she been free...