The reason I suggested a perch in the crate is to keep her out of her own poop. I let an old disabled hen sleep on the floor and she developed fly strike.
Both. But then sometimes it's the more laid back two that fight the mean ones! It changes all the time and they have all fought each other, but there are two so far that have drawn blood (one of which is the injured one in the photos! 😩).
A dog house or crate sounds like a good solution to me. Does she have to sleep in the loft? Could you place a short roost in the crate for her instead?
Once my four female Muscovy ducks matured they have not stopped fighting. Well, they'll stop for a couple weeks, but then they are back at it again, and now it doesn't matter if they are laying or guarding eggs or not. I posted about my Muscovies bullying each other a year ago...
Actually, they are not too little. I integrate at 6 weeks and some integrate even earlier. But now that they are older you might have a harder time integrating them with the hens and rooster. It should work out but it may take longer and there will be plenty of pecking (a little pecking is...
They should have been in the coop with the older birds 2 months ago. Is that all the space they'll have or are they going to be allowed out of the crate?
I wouldn't recommend it. While wire mesh may not hold as much poop and feed, it is even more difficult to clean. Maybe you can cover part of the floor so they have something solid to stand on?