I agree with desertdarlin. If something is getting the eggs, something will get the ducklings. I would talk to her about improving her security before trying.
Ducks aren't as easy to give ducklings to as chickens are. Also, you are looking to give 10 day olds to a broody and they are nothing like day olds. You may have a duck that will want to foster them but you need to be prepared to raise them yourself. I tried "slipping" some extra ducklings under a new mom once. She knew they were not her's and did not want them they were 4 days old.