My ducks won't take nothing off the chickens but different breed to I think Muscovy's may be a bit tougher,. My Game roo use to try and push around a drake and the gander but he finally learned that wasn't such a good idea. You may just have to keep them separated for good. How is her eye looking tonight?
It's funny ML none of my ducks will challenge my chickens, they are darn cocky my ladies.. and i would definitely not say my flock is docile, the one scovie duck went after my call duck!