I think one of my hens had a stroke or something she agent out to free range and started sckacking then his under some brush her wing whent out and last 2 days she has been hanging her wing low and now always up on top perch and she stumbles a bit when she walks at first
Could be a stroke or a pulled muscle in her wing . They use wings for balance ...so if it is not properly balanced they may stumble when they start out