Oh thats a new one! How is she with other animals in general .. does she chase birds in the garden? I think thats the first thing to think about as i imagine alot of this will be about the individual dog.

From there you can work out how you introduce them ... do the ducks roam around or will they have a little pen - you could start by just having them in the pen and let her sniff them and see how she reacts ...

I am sure someone on here will have done this before and give you some more advice ... good luck!