Duck Not Sitting on Eggs?

A couple of days ago I found a duck nesting with one little duckie. Later some of the eggs hatched and I fed the ducks everyday. So there is the mom, the big duckie and the little duckies, but there's still 5 eggs in the nest. I'm worried did she abandon her eggs? Are they still gonna hatch and how is it possible that she has an older duckie and younger duckies?