I keep calls together with Campbells and I've had no problems whatsoever. The Campbells are big enough to hurt the call ducks purposefully or accidentally; but everyone is happy and respectful of each others space.
Considering their size, call ducks generally punch over their weight.
They...
It could be juvenile colours; there's no guarantee that she'll lighten up any as she goes through the molt though.
Either way you've got a pretty bird there!
There was a thread about making diapers out of small socks for use on ducklings - a slightly larger sock might do what you need!
Edit -here it is :)
https://www.backyardchickens.com/t/563787/made-my-own-duck-diaper-directions-added
I've only bred the 2 so far and to be fair they are mallard/call crosses - but their beak size at hatch was tiny; they looked to be taking after their call duck dad.
However as they've grown, their beaks have quickly developed into a more mallard like size - so as babies they looked to be...
She's in that scruffy stage but it looks ok to me. I think angel wing tends to throw the wing tip out sideways. To me yours looks like feather cases pointing up from the wing (but it's late here and I wear glasses! ) I'd just keep an eye on it and make sure she's getting her vits!
Not trying to put a downer on things but my mallard is way more affectionate than my call ducks - also more aggressive and schizophrenic to be fair!
My call/mallard crosses however are friendlier than anything (including my cat!) so there's something to look forward to!
For the record tho, my...
mum and her 2 new babies (Crispy and babes are Chopper and Chester)
Charlie their Dad
Curious as to how they'll turn out given they're dad is a call and mum is a rescued mallard!