Do her feet look ok? I have a sizzle, Charlotte, who does that because she has curled toes and I think it feels better to rest them. Sometimes she stands holding one foot up because that seems to be the problem foot. She's also neurotic and doesn't act like a normal chicken. Not sure if she got pecked or was just born nuts. The rest of the flock treats her like a handicap. The make room at the food dish, nobody picks on her and she's just ignores everybody else except my roo, who protects her and my head hen who's taken her in as one of her chicks. She's seems to get along just fine. Just lots of odd behavior.
Here's her with my head hen, Jane and Janes chicks