We have 3 silkie chickensa about a year and a half old.one has always been a bit smaller then the other 2 bur really sassy and healthy..recently she appears to have lost weight and is having serious trouble with balance which has now turned into her not walking at all. I checked her for an injury to her legs at first bumblefoot leg mites and we've been giving her vitamin B in her water but I am not really sure what deficiency she might have which is what I think it is so I'm not sure how I should be treating her. If anyone has any suggestions as to what she might have and how I can fix this I would be very grateful because these are three very large little chickens and I don't want to see something happen to her