Sorry for not responding sooner
@Miss Lydia @Krazy Duck Lady , but this is how I managed to catch her.
She had been on the same body of water for a couple of days, about a kilometer from where we live. Three times a day I went over there to see her and call for her, to see if she would approach and take some food. The day before we caught her,
@Stipenvlerk actually drove over to us to help out and we waited for over an hour, landing nets in hand, with one of the other ducks in a crate. They did a good job calling out to each other, but the runaway duck didnāt approach.
That night, we had some strong winds which woke me up and I couldnāt get back to sleep. So I went over to check on the runaway duck. She was swimming very close to the shore, probably because it was quiet at night and there were no people and dogs and cars coming by. I went back home to pick up one of the other ducks and had it with me in a crate. I kneeled down near the crate and scattered some food around and she came closer and closer. She was still cautious, any sudden movement startled her.
The landing net was laying flat on the grass in front of me and at one point, while she was busy eating the food around the net, I just flipped the net over her in one swift movement, like flipping a pancake, and caught her!
At that time, it had been a week since she had flown away. It was probably a combination of hunger for food, the quiet nighttime and the other duck in the crate that made her come close enough to catch.