I have lost a bunch of ducks over the years, we free range. I never give up hope for at least a week though, and once, our mallard came back after 3 months. if it's a good flier, it could have gotten scared up into the sky, and then gotten confused... sometimes they make it back, and sometimes they don't. Have faith, and tell your daughter that ducky probably flew up and has landed on another pond. I don't tell my kids the bird is dead unless I actually see the corpse.
