Sick Duck - Advice please

[Daneva35]

My campbell duck has become very wobbly on her feet and seems to be sleeping or at least resting, with her eyes closed a lot of time.
She is about 11 weeks old and we have only had her a week. She has been fine right up until today. The other duck we bought with her is fine and still running about foraging etc.
I have made an appointment with the vet for tomorrow, but has anyone got an idea of what might be wrong.

 

[HollyDuckFarmer]

Wobbly feet can be a Niacin deficiency, easily remedied thru diet.

 

[Amiga]

Adding brewer's yeast to their food or 150 mg niacin per gallon of drinking water are two of the most common ways to address a niacin deficiency.

It is possible she could have an infection, ducks hide their illnesses. Hope you can see the vet soon.