I have a 6 month old pullet that is unable to stand. She can walk with extreme difficulty. Her legs spray out from her whenever she stands and she keeps her talons clenched. I just separated her from the other pullets as they are pecking her and pulling out her feathers. She is housed in pine shavings and is able to get water and food. Her poop is normal in appearance. I have tried giving her yogurt and lots of greens. Her color looks good with her comb a lite red in color. She has to use her wings to walk and flops whenever she moves. This all started about 3 weeks ago. Any help would be greatly appreciated.