I have no idea if this scovy is sick but I can say I have never had a female Muscovy hold her wings like that. Only my drakes have problems holding their wings normal when the feathers are full of blood. I don't know why that is unless the females wings just aren't as heavy. I hope the OP will answer @casportpony questions. With having Muscovy's for a few years now that doesn't look normal to me. Not saying she could be sick but may there is an injury to that wing?