I'm a new chicken tender and yesterday afternoon while doing some improvements on their run, I noticed on of my silkies dragging her head and unable to walk. I had been in and out of the coop and run several times over the course of 3 or 4 hours and she was completely fine, walking eating etc. I'm wondering if it's an injury? I've read about vitamin deficiency but they are still on Nutrena grower feed and I use Wellness Brew in their every day water which has added vitamins. Please help! How do I help this chicky babe!?