I don't think mule ducks quack... but i could be wrong, i have only had a few and they were quiet like my muscovies. And sorry about the eye thing, i missed that tib bit there at the bottom!
The bill looks Muscovy but her butt is too short and the down is pretty wispy-looking.... maybe a muscovyX ? rouen muscovy? very cute though!
Is her eye okay? she looks to be squinting in the newest pic and it looks a little red maybe.