About a week ago I was checking on my chickens to make sure they had water and make sure they hadn't laid anymore eggs. I heard a lot of commotion as I was walking off and I went back to check it out. I noticed a rooster just being a rooster...lol But then I noticed that the hen he was after couldn't walk on her feet, but could move around by having he legs on the ground and walking that way. When we took her out of the coop we noticed that she seemed drunk. When she would try to stand on her feet she would stumble forward. On Sunday, I was told that it appeared that her craw may be to full so it was causing her to be off balance. I was told not to feed her for a couple days but make sure that she had water. So after a couple days I noticed that she still couldn't stand, still stumbling, and not really moving around a lot. Last night we went out to check on her and she appears to be a normal chicken with the exception that she cannot stand on her feet. She will "crawl" around the cage I have her in but not stand. Oh yeah, She is a 6 1/2 month old Rhode Island Red. Is it possible that she may have a back injury or something?