In the very early morning we went back to look for her, but – again we couldn't find her.
Oh I felt so desperate!
In a normal situation a duck lays about 10 eggs per nest, and if there are signs of life in them, then they start to brood on it. Pipke kept on laying eggs, because they weren't inseminated (obviously). She heard no life signs in her eggs – and this would become a very big problem for her in the future.
About the future I will tell you later.