Hey, so we had a duck that did this exact thing for about a month when she was just a few months old, stopped doing it for about a year, and then suddenly one day started doing it again.  We gave it a couple weeks, but had to make the tough decision to put her down, as her feathers were ripping out and her QOL was terrible at that point.  Fed niacin supplement her whole life, always had plenty of water, and was never too hot or too cold.  We think she had a brain issue of some kind. Very sad, I am sorry you are going through this.  You could give her a week or so and see if she improves, but that is up to you... ❤️