It should work on mama duck too. Be patient. She's been around a while and may be slow in surrendering her suspicions. But when treats are involved, well, they all have their price.
Chasing, pouncing, and nabbing are unnecessary. With just a few minutes of training, you can get them to come to you on command. It's easier than training a dog.
I use a clicker I bought at the pet store for a dollar. I offer treats, something they can't resist such as meal worms, while...