You calling this duck he drakes don't lay. If this is a female then my rec would be to get some Calcium Gluconate TSC carries one and it will say injectable but we use it orally, 1 ml over a really tasty treat if not eating then you can give it by mouth. Calcium Gluconate works to get a stuck...
@chloeb67 is this the same duck you think has something stuck? Can you tell if she is pulsing her vent like she needs to lay? Can you post a picture of her face so we can see her eyes?
Taking time off from laying is a good thing, they can get depleted from calcium so their body has to take a...