Angel wing can also be genetic, Not always poor nutrition.
Is this duck yours @G1NA you can trim her feather so they don't stick out so far. and if she is still growing them in can't really tell you can wrap them so they lay flat against her body, If interested in wrapping we can give you advise on that. Also can show you how to trim.
In my personal experience, the AW was presumably due to genetics. Wild flocks of ducks often developed AW and in a lot of the cases that is due to consumption of unhealthy foods ( bread, snack foods, etc).
As long as you are feeding them a nutritionally correct diet, and they are getting plenty of exercises I would not blame this on your management practices.
At this age, bandaging will most likely be ineffective. Cutting the feathers would likely be the best option simply to prevent the feathers from getting caught in things, and to provide better aesthetics.
As far as cutting, I would secure the duck, and gently spread the affected feathers out, and aim to cut all the primary feathers. These are the longest feathers of the wing and most of what is sticking out in the picture. If you notice the very base of the feather shaft appears purple, you will need to wait longer as there is still blood in the primaries.