My duckling started having trouble walking and she was stumbling a lot. Then she started sitting to eat or drink, like she could not hold herself up. Now when she gets up she wobbles like she cannot find her balance and whether she is sitting or trying to walk her head bobs and is wavy from side to side. Now when she does walk she walks on the backs of legs with with her feet and the first half of legs flat. In fact she is starting to get sores on the back of the joint where she is walking on them all the time. I have been supplemeting her, as I really thought this was a niacin/nutrition issue but she is still not getting better. Is there anything else I can do for her or should I just wait and see if the supplemental nutrition kicks in? Thank you for any insight.