Woke up today and went outside to let the hens out of their coop. One of our chickens was unable to get out of the coop by herself so I lifted her out. Turns out she can't stand, can't walk, acts drunk/dizzy and keeps falling over. No balance at all. She's looked crappy lately but I thought that was just because she was molting. Otherwise she's been fine, just scruffy looking. She is right about one year old and I do not know if they were vaccinated against Mareks- never even occured to me to ask the person from whom I got them. Any suggestions? We're pretty new to chickens so I have no idea what I should do. Edited to add: We've removed her from the rest of the flock and have her in a dog crate for now. She ate a small cup of yogurt with no problem this morning and is now eating some feed mixed with some BOSS. She also seems to have no trouble drinking.