I received 25 mixed pullets from Mt Healthy in May and they have all been active and healthy so far. Yesterday I noticed one of my BL's acting sort of drunk. She would shuffle and scuttle along stiff legged and rock back on her legs as though trying to keep her balance. The chicks were all vaccinated at the hatchery and have had very little in the way of treats, other than corn and a couple of grapes. I have isolated her and she still eats and drinks. Her poo is loose. Her eyes are dark and bright still. Any help would be appreciated.