I see in your one picture that you have a dog kennel in the corner. Maybe you could keep her in there for a day or two so the other ducks can't actually harass her? That worked well for me, it made the new girl feel like she had a safe space and she acted more curious than afraid when she had the safety of the kennel door separating her from the others. Plus you can give her treats through the kennel door and she'll associate you with good things.
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