Because ducks are prey animals they are very good at hiding pain. Is she eating like normal? When one of my runners broke her leg up at the hip joint there were 3 cracks ( we got it xrayed) I thought possible dislocation boy am I glad I did not try to force it back in because that was not the problem . But with the broken bones she refused to eat so I had to tube feed her. Vet gave pain meds also. Is your duck eating like normal??