No idea…hard to tell from that angle as well. But my white call duck just molted last week..she lost basically all her flight feathers in a few days…actually a bunch of my ducks are in molt right now
can you catch her and do a close up exam , take a better picture, it doesn’t look good to me ( not normal molting) but in the pic you posted it looks like little holes and that could be botflies - if it is you need to get them out - i’ll look for a link,
edit to add
honestly i think it’s just that the pic is blurry and it’s probably just molting -