Subsequently due to the fact that you're keeping her inside, likely under no access to a deep water source, she could be developing a bacterial overgrowth in her eye or has gotten some bedding or dust which is causing some irritation. You can try flushing the eye with some saline and try...
Sadly, besides what's been suggested in this thread, there's not much you can do at home. I would say if you're seeing improvement with the supportive care you've been doing, continue that, but if you're not you'll need to see an avian veterinarian willing to see poultry, as it's going to be...
In addition to the Rooster booster, it may be good to start her on both vitamin E, and cattle B complex. You can give her 1ml of Cattle B complex, overfeed, and one vitamin E soft gel a day.
https://www.tractorsupply.com/tsc/product/durvet-hi-level-vitamin-b-complex...
Excuse my recent questions, I had you confused with another member.
Looking at the video it's obvious she's having some problems staying balanced; along with the involuntary muscular movements, which suggests there is likely something directly affecting her neurological sytem. Please refer to...
Off the internet, I'm unable to tell you if her back is broken or not. There are some conditions such as scoliosis the can cause an irreuglar shaped body. If you we're witnessing the same irregularities in several birds, I would find that rather unlikely, unless all birds derived from very poor...
How is your duckling doing now? Is a vet an option? Do you have a few pictures of her?
Ideally, due to her current dyspneic state, you'll want to give her some time to acclimate to her surrounding before handling her much, as that could send her over the edge. If you get to the point where...