Yeah, my wife and I would laugh when this happened with our first two ducks (they were 6 weeks when we got them). "Ooooooh, you are attacking me with a big down pillow." It would happen when we hand fed meal worms. They would start by shaking then lunging at us, then shaking and taking quick jabs out of our hand, then shaking and eating out of our hands, then just eating out of our hands, then climbing in our laps (if we were sitting on the ground) and eating out of our hands. When we got the rest of our ducks (at 3 days old), they reacted similarly once they hit puberty. All my ducks settled down fairly well by about 4 months. But at 9 months, I would guess something happened that made Happy a little more nervous (we have had this happen to our ducks sometimes). It could be any change in routine (moved water from one side of the yard to the other), pools got packed up for the winter. You picked her up when she had actively growing blood feathers (I guess they are kind of tender). The leaves fell out of her favorite shade tree. She saw/heard a predator closer than she was comfortable with (even if she was safe.) Just about anything can shake them up a bit, but they come around again. You never can tell. One of our runners, Dove, was always so close to us that between my wife and I, we stepped on her feet on at least 4 occasions (fortunately on nice soft giving grass). This didn't even phase her for the moment... We would lift up our foot and she would lift hers and all was good. But we had a real cold day (-20F overnight) about 3 weeks ago when she was in mid-molt, so we brought her inside for the night, let her swim in the bathtub and stay in a dog crate until morning when the sun came back up and it was warmer. She is just starting to trust us again because that shook her up. (Silly ducks).