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No it is not possible for them to ever successfully breed. Certifiably impossible, lol. It happens most frequently in wild type ducks because they commonly live longer than heavy domestic ducks.

Perfectly normal for older wild type duck hens. Their bodies stop producing female sex hormones because they stop laying, which makes them assume some drake plumage since male is the "default". She might even try to breed other hens, though obviously unsuccessfully. It won't affect her in any...