So happy to hear she made it that's great news. Here's an article about wet feather that may help http://www.majesticwaterfowl.org/artwetfeather2.htm and I'm going to ask Amiga to talk to you about soft shell eggs and what she has been doing to help her ducks with their problem,.
Have you inspected the wing? Very gently feel it all over and check if dislocated. It may not be broken but Id' place it along her body like they normally carry them and use vet wrap to make a secure bandage but try and just secure the injured wing so she can use the other one for balance...