Usually we don’t see the flying preds until it’s to late. She should be cautious she had a terrible experience. Before a red tail hawk came down in front of my birds and killed on of my chickens my ducks would just stand and look up when a hawk was flying over head even when the rooster would...
Thank goodness, what ever happened to her really scared her good but glad to hear she is getting over it. Hopefully her appetite will come back soon too. :fl
What are the symptoms of shock
https://www.tillysnest.com/2013/12/shock-in-backyard-chickens-html/ If the OP heard loud quacking then came upon her duck it could have very well been a predator attack. We don't know for sure. but having activated charcoal on hand is always a very good idea.
She pretty, hopefully if this is shock keeping her calm and quiet will help her to get over it. Maybe put some vitamins or electrolytes in her water and just wait.
Wonder if what your seeing is shock? Keep her in a quiet place out of the way of foot traffic. And just watch Her. Going through the trauma of an attack can be awful for one if that’s what it is. How old and what breed?