I was outside with the chickens throwing scratch out to them and my almost 1 year old OEGB grabbed up a piece of grass. Then she started clucking really loud, fell over sideways, rolled over and stood with her back end really low...like her legs couldn't hold her up. Then she pooped a large poop (which was completely normal looking in color, texture, etc) and tried to take a few steps, but was acting drunk. I stepped forward to pick her up and she let out a loud yell, went flying the opposite way and just stood there. I picked her up and held her for a couple of minutes. Now she is acting completely fine. What in the world happened?