Well, that will take some time to heal. If you can cage her, but keep her with her flock, she may heal, but still be a part of the flock. That way you won’t have to go through the ordeal of having to reintroduce her. If you can get some human B or super B complex tablets from Walgreens, Walmart...
Have you checked the bottom of her foot pad for a bumblefoot scab? Pictures may help. Do you normally keep your chickens outside? I would keep her in a wire dog crate with food, water, and bedding, but keep her near the other chickens so she doesn’t lose contact with them. If she has sprained...