My runners do the same as yours. It's a never ending mini pillow fight.What breed are your ducks? - Other than Bantam, Mallard and Muscovy ducks no other duck breed requires trimming of their flight feathers.
None of my 29 Ducks have ever undergone what is called a "hard molt", when the majority of their feathers fall out, sometimes even expose patches of skin. My ducks are in some kind of "permanent molt", they loose feathers which regrow, then loose the next batch of feathers and so on. A hard molt is something undesirable for a duck, especially during cold weather.
Your duck looks similar to what mine do, pushing the feather shafts out, then fluffing them up.
If she behaves like a duck, eats, drinks, poops and makes a mess with water and food she's very likely ok.