Can you post a recent photo of her with the dropped wings? Does she seem ok otherwise? Are her droppings normal?
If she is eggbound (has a stuck egg) it can be dangerous. It's probably a good idea to give her some calcium.
I know in some places you can buy special liquid calcium but I've used regular human calcium tablets successfully (with chickens). You can just mash it up into a treat. I don't know what you can get there but the liquid would be good if you could get it. @KsKingBee will know more about the dosage and how to check if she's eggbound. Or you could do a search on here. Here's a post about it from earlier this year, for example.
Another thing to consider would be something taking the eggs. I know you said they've been taken from outside but what about within the aviary? Are you certain nothing like a rodent or a snake could get in? If something has taken a duckling that could be a possibility. Are you getting duck eggs without issues?
If she is eggbound (has a stuck egg) it can be dangerous. It's probably a good idea to give her some calcium.
I know in some places you can buy special liquid calcium but I've used regular human calcium tablets successfully (with chickens). You can just mash it up into a treat. I don't know what you can get there but the liquid would be good if you could get it. @KsKingBee will know more about the dosage and how to check if she's eggbound. Or you could do a search on here. Here's a post about it from earlier this year, for example.
Another thing to consider would be something taking the eggs. I know you said they've been taken from outside but what about within the aviary? Are you certain nothing like a rodent or a snake could get in? If something has taken a duckling that could be a possibility. Are you getting duck eggs without issues?