I was just talking to haunted55 and she had a bit of advise also Pmed casportpony who haunted says knows how to tube feed so hopefully we'll hear from her also. But in the meantime haunted 55 says to get some poultry vitamins mix amount they say for 1/2 gal of water but your going to be putting it into 1 cup instead[think mega dose] also mix the calcium /vit d that you got from the vet into this mixture and use a 3 mil or larger syringe with out needle of course and have someone help hold the duck while you open her bill put syringe on the right side of her throat as far back as you can and very slowly start putting in this mixture [right side is food side tube on ducks.] She thinks if you can get the vitamins mixture into her for 24 hrs you should see a turn around where she'll begin to eat. I have no idea Pet Duck I am relaying a message to you from 3rd party.