Broken wings are easy to heal, IMO. There are two ways to treat a broken wing. First, you need to know if the wing really is broken.
I am sure that you probably know whether or not the chicken actually does have a broken wing, so please don't take offense, but, when she holds her wing at that funny angle, you should be able to reach under and feel the wing bone. If there are small, gritty feeling things under the skin, then the bone is definitely broken.
Now, if it
hasn't broken the skin, you have two options: The easier one is to take a long stocking, and cut the closed end off. Then, slip this over the chicken's head, and adjust it around her. It should sit pretty tightly, bonding her wing closely to her side. This will also keep her other wing bonded down.
The other way to do this is to take gauze bandage, and wrap it around your chicken's chest. This is more expensive, and works the same way the stocking method would.
Hope this helps, and hope your henny gets better. Praying for your!
ETA: This coming from someone who has dealt with a broken wing before.