https://sites.google.com/a/poultrypedia.com/poultrypedia/poultry-podiatry. Go on here an scroll way down till you come to chick shoes,for your duckling i’d wrap up around her leg for support of the ankle. Just be careful not to wrap to tight that circulation is cut off.
Giving the b complex over the mealworms is a good idea . As far as her development it may all tie into each other the way she walks etc. but she is developing so that’s a good sign. Maybe give her a bowl separate from the others I have to set out multiple feeders here, hopefully she’d at least...
I am not sure if this is a niacin deficiency especially since it’s been 2-3 weeks and your not noticing any improvement. I wonder if it’s a birth defect? Did you hatch this duck? I wouldn’t quit the b complex but is it possible you can take this duck to a vet for an examine? @Isaac 0 any ideas?
This has been going on since hatch? What brand of b complex are you giving and how much and how? Is that corn your feeding? I’d cut out the corn for now.
Posting some pictures would be a good idea and a video of her walking? To post a video you’ll need to put it on Vimeo or you tube hopefully we can help you.