Here is a video, at 1:14 you can here my Mallard drake. And at 3:01 you can here the Mallard hen. Which noise does Wire make?

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From that picture I am 95% sure she's a hen. Drakes usually have more silvery wing covert feathers, and a darker tail, even as juveniles.
Wow that is interesting! Have they always had curly feathers? Does Einz still sound like that?Just wanted to mention that some individual ducks do not fit in perfectly with typical characteristics.
For example, I have two female ducks - with the curly drake feather. But they are for sure certain females.
Einz screamed so much at a certain time in her life that she became rather hoarse. Not quite drake voice, but not the typical female quack.
While Wire does look like a female duck - he or she may be one of those unusual ducks.