Water therapy is really good exercise as long as the navel is healed. Just start them off with just enough warm water to float and always supervise.
@3bird is having similar problems with a duckling that is older and might be able to share what they are doing to help theirs. Theirs has slipped...
So adorable. do you have any poultry cell or Nutri drench for poultry? both are really good to have on hand for an extra boost with newly hatched ducklings. Also you will want to add some niacin to her diet. Nutritional yeast is a good one just sprinkle 1 Tab over each cup of feed you offer her...
@Quatie
@HollowOfWisps
@DuckyDonna
I don't use incubators but if mine I believe I'd turn the egg up so the pip is at the top not the bottom.
That's the fat end of the egg?
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/