Plenty of fresh water, get the food grade activated charcoal a.s.a.p, I would talk to her. Is she a friendly duck or does she shy away from both of you?
Sometimes talking to them, you can gauge how clearly they are able to think by their reactions to you - are they "with you" or really spaced out? I think I would also consider electrolytes.
Also if it's going to be really cold tonight, I'd bring her in where it's going to be closer to 50 or 60F than 30F - I don't know where you are….
She's normally pretty sketchy and let me pick her up, several times, stretch her neck and try to dislodge whatever might have been in there. We're in western washington, should be about 50 tonight. Have her covered. Will get the slurry going, I've medicine syringes for cough syrup, will that work? I'm checking on her again now.