She was nearly killed less than two weeks ago...it sounds to me like she is recovering. I have had ducks with pulled muscles that took nearly a month to completely heal. She was traumatized, and we don't know the extent of her injuries.let me just do a little update on her. She was doing great and i put her outside a while ago and she has been living out there with her friends again. The only thing i am worried about is that i would think by now she would be okay but she is just weird. She will follow her friends around but she just stands there and does nothing. She isn't acting like a "normal duck". She either stands there blank while the other look for worms and bugs or she is sleeping somewhere. I also noticed the other day that she is shedding feathers alot! She would lay somewhere and there would be feathers everywhere in that spot. I don't know if that is normal or not.
There may be a systemic infection going on. She may have internal organs still healing. Molt can be induced in the aftermath of trauma. So I would say she is within the range of normal for a duck that was attacked about ten days ago.
She needs to be watched, as I know you are doing, and you need to be on the lookout for any signs of infection (very warm bill and legs, continued lethargy, really odd-looking stool) and keep giving her good nutrition, fresh water, and TLC.