Since she’s having such serious issues now, I’d go to TSC and get the liquid b complex in the cattle section and start her on 2 ml it will say injectable but just peel off the foil and suck up 1 ml put it over something yummy like a small hand full of mealworms so she gets full dose or any other yummy things he likes if it’s a b deficiency she should start feeling better soon. Is she crested? Any other ducks you have will def benefit from the complex also.a deficiency can actually kill them the feed doesn’t have the amount of niacin our water fowl need
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