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What is it being fed? Looks like niacin defiency is a strong possibility. A tablespoon of brewer's yeast each day in the food may be what is needed. It won't hurt.
You could also put either plain niacin or a B complex vitamin into the drinking water. Rate of 150 mg niacin to 1 gallon of water. Use the niacin portion of the B complex to determine how much of the vitamin to put in a gallon of water.
I checked the leg, both at the same time to see if there were any difference and there weren't. But since she is putting weight on it now and running around on it, I guess everything is good.Oh my, the poor thing. :/ Looks like possibly the tendon has slipped out of place on that leg. Hard to tell for sure without seeing that leg up closer. Have you read through the Poultry Podiatry page? It might be helpful in this case (scroll down to "slipped achilles tendon" section):
https://sites.google.com/a/poultrypedia.com/poultrypedia/poultry-podiatry
The leg could also be broken somewhere. Just not a good sign that the duckling doesn't seem to be able to use that leg at all.
Chick starter has only about a third of the optimum amount of niacin for ducklings. And a layer mash won't be formulated for optimum nutrition for growing ducklings. Many feed the layer to all their birds, I realize.
From what I have seen over the last few years on the BYC Duck Forum, there are a number of ducklings who need much more niacin than they are getting. Once that is corrected (brewer's yeast, plain niacin capsules, B complex capsules), leg problems, even sometimes seizures go away.
I have read that the high levels of calcium in layer feed is not good for non-laying birds, including drakes and ducklings. We each do the best we can with what we have and what we know.