Have you tried talking to the folks at your local feed store? are you making sure you duck that's left is safe and secure? you could give her a mirror to keep her company till you find another duck I'd actually get 2 more that way Heaven forbid it you lost one there would still be 2. What happened to the duck that died? I assume it died. Here in the USA we have craigslist do you have anything like that on line/ they have a farm section you may find ducks there or any rescues close around you?