We have a couple of bird folks who post regularly, so perhaps they will offer ideas about the duck and the cat. In the meantime, I would be concerned about that cat - do you have a long range squirt gun or a toy of some sort that you can deploy if you see the cat coming into the area? I'd be tempted to chase off the cat for the time-being, whether a wire enclosure is set up or not. Is the duck conspicuous when she's on the nest? Usually they find a spot out of sight and sit very quietly.
We've had them nest in my neighbor's Mexican Feather grass, but the predators around here are coyotes coming through the area at night. I think the ducks were safe the whole time.
_________________ Northwesterner
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