If she just moved her nest, I'd move it again and put it somewhere that you can keep her confined. You don't need to literally confine her on the nest but if you make her a nice nest in a quiet, darkened, safe spot, put her eggs there and then leave her with it she may be receptive.
When I've had ducklings with a momma, I partition them off from the rest of the coop overnight and in the morning I let everyone out and then open the partition so mom and babies can roam the coop for a few days. If you are able to let out your other ducks and keep her locked up that would work.
A word of caution though: Make sure that everyone else has another area that they can go to in order to avoid predators, get out of the weather etc. I have a chicken and a duck coop that are within the same big coop but completely seperate. If a hawk flies over, the chickens will go into the duck side, that door is closer, but they will also all go into the chicken side if the door for the ducks is closed.
When I've had ducklings with a momma, I partition them off from the rest of the coop overnight and in the morning I let everyone out and then open the partition so mom and babies can roam the coop for a few days. If you are able to let out your other ducks and keep her locked up that would work.
A word of caution though: Make sure that everyone else has another area that they can go to in order to avoid predators, get out of the weather etc. I have a chicken and a duck coop that are within the same big coop but completely seperate. If a hawk flies over, the chickens will go into the duck side, that door is closer, but they will also all go into the chicken side if the door for the ducks is closed.