It's not dislocated. It's broken. Tough call. There is little chance that the wing is going to heal properly without a pin surgically placed to hold the bone(s) together. If you do not care about aesthetics, then you can get the wing healed to the point where it will not be problematic, but it is always going to sag and look unsightly. That being said, I have a goose that has a broken wing that never healed properly. She won't win any beauty contests, but the wing doesn't bother her overmuch. I keep the feathers trimmed routinely to prevent any extra weight from pulling down on the wing. She flaps it around like it doesn't bother her at all. I am always disconcerted when the wing bends at the break and not at a joint, though. At this point, her fracture probably has formed a sort of soft joint. Not ideal, and definitely not conducive to flight, but it works for us.
Put the wing in a neutral position and secure it to her body with Vet Wrap (also marketed as Coban for humans, but wickedly expensive). Leave her other wing free of the wrapping, so she can learn to balance with just the one wing. Change the wrappings whenever they get wet or soiled. She will need to keep that wrap in place for several weeks to months. Fortunately, she is young, so she should be pretty OK with handling and care. Ice the area as often as you can for the first couple days. The ice should help with the swelling. No pain medications should be used on her, since the only real painkiller safe for birds is aspirin and she should not have that since it increases the risk of bleeding. Broken bones bleed a lot anyways, so you don't want her bleeding out anymore. It will just increase the swelling. Do not be surprised when her skin all turns green in a day or two. Birds bruise in day-glo green. It is very alarming the first time you see it.
