Yah, the duck looking at the camera in the first picture looks like she's got the start of angel wing. Can you arrange the turkey feed so that the turkeys can peck the food out, but the ducks can't fit their bills in to scoop it? Can the turkeys hop up on something that the ducks wouldn't be able to reach? Game birds need MUCH higher protein levels than ducks, and that super high protein is probably your problem.
At this point, if you lower the protein, there's a chance it may correct itself, but most likely you're going to need to treat it. If you do it before she's done growing, she can recover completely, but it's a pain. I've actually never been able to do it successfully, so hopefully someone will chip in and describe the technique. I know it involves wrapping it tightly with Vetwrap, but I can never get it so it doesn't fall off.
Of course, now that I keep their protein levels down after the first couple weeks, I never have that problem, so I never had to learn to do it properly.
Good luck. I hope she's able to recover, but even if she doesn't--it isn't life threatening. Just cosmetic--and maybe a bit uncomfortable.