Duck & hen incubating same eggs

Hi everyone, I have a pair of call ducks living with my silkies. The duck made a nest and has started setting. I have been checking several times a day (it's lambing time and I'm up day and night anyway) and the duck seems to be setting during the day and a silkie hen sets at night. I suppose she can't help herself since she's a silkie and she found some eggs. lol The eggs are all duck eggs and there is always someone on the nest. Can this arrangement work? If I do get any ducklings, I imagine they will follow the duck to water, but maybe not. Has anyone had this situation and, if so, how did it turn out? Thanks!