Ducks that do not get in the water much can have less healthy feathers, from my experience. Yes it is odd to see laying and molting at the same time. I agree that if she is not shedding water, best to keep her out of it for now. I would add a little extra protein to her diet for now, maybe switch to a breeder feed for a bit to pop up the nutrient levels, see if that gives her a boost to get in some better feathering long term.
When we got Rowena she sank like a stone. A few months later, with some TLC and breeder and high quality layer feed (no corn, no soy organic), she floats like a cork.
When we got Rowena she sank like a stone. A few months later, with some TLC and breeder and high quality layer feed (no corn, no soy organic), she floats like a cork.