I would suggest not clipping the wings. My ducks all have clipped wings but I won't do it again, unless they really are going to leave. Once they are settled into their home, they really have no need to leave.
If her mate can't fly, it's very doubtful she will. That is effectively clipping her wings.
My main reason though is predators. If they NEED to fly then I'd rather they did, not get pinned against the fence and munched.

TY. I understand. She'll probably stay then. :-)

Forgot to say that the mallard and call duck will be living in a large dog run with a roof, coop and infrared light placed high up in the coop, same way my old chickens have been living all these years. So I guess I don't need to worry about it anyway.
I had let them out of their coop yesterday and my Blue Swedish drake, Mr. Flappers, can't figure out if he loves them or hates them. So I changed things for the time being at least. :-)