Could you post a video of the duckling breathing? What is the temperature in their brooder, and what breed are they?

Waterfowl often can suffer from Aspergillus, due to fungal spores in their environment. This is often due to poor management practices, that allow bedding to become filled with fecal matter, and become wet. The spores can start to colonize inside their lungs, and cause serious respiratory problems. Regardless if that is the problem or not, it would be a good idea to disinfect the duckling's brooder, and ensure the bedding, and feed is both kept as clean as possible. Increasing ventilation in their pen area, and allowing sunlight in may be beneficial too.

Fungal problems are often difficult to treat in ducklings, but the use of a fungistat may prove useful. You could use Nystatin, miconazole, or swab the inside of her mouth with gentian violet in hopes some of the moisture will pass into their lungs. Ideally, some sort of nebulization therapy would be done. You can try offering them warm soupy feed, or mashed scrambled eggs often. Let us know how they do.
https://drive.google.com/file/d/1mIQIt5CBJMeppR8rgordQOH5AVhFsN3s/view?usp=sharing
I put a lamp above them when they sleep but for the sake of the video I put the duck out. Unfortunately, I don't know what breed it is.
 
Do you know what is the name of the virus or the bacteria infecting her?

Sadly, no. I can give you some suggestions on what it may be, but to provide you with a diagnosis, I would need to see the bird, take swabs from her, direct swab them on a slide, and inoculate the bacteria on plates to determine if there is any yeast, fungi, and bacteria present, and what it is they are.

Looking at your bird, it could be a fungal problem like Aspergillus. It could also be a crop-related problem, pneumonia, etc.

I would start off with the basic treatment I suggested in my first post.
 

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