Go with something liquid, then, if she can swallow. She's able to drink?
In a perfect world, you could get her to a good duck vet. But I know most of us don't have that option. If you can, do.
But for now, there are things like Poultry Nutri Drench for calories and a few vitamins. But I would emphasize the Bs and maybe E. Maybe you could take some starter crumble and mix it up with a lot of water into a slurry, see if she could sip that.
I need to turn in, but I subscribed to this thread, so I plan to check email in the morning for notifications.
Hugs and prayers to you all.
Edited by Amiga - 9/22/15 at 7:19pm