Hi, I'm new to owning ducks. I have a Peking duck that's almost 2 months old. She recently stopped walking. I immediately started niacin drops and also brewers yeasts. I checked her over for injury but found none. She eats and drinks but its little. She also isn't lifting her head now. She did have a very hot beak for a few days but it seems back to normal. But she still isn't moving around at all. Oh and she lives on a farm pond with 4 other ducks but the other ducks seem fine. She is currently in a dog crate to protect her from predators. Any idea what may be going on?