That looks like damage from mating. Give her time to think about growing them back. Watch the ones that are broken at the skin level to be sure she doesn't get an ingrown feather (think - ingrown hair) If caught early, easy enough to fix with some warm compress and a bit of thumb work to press/push it out (one thumb on either side - think popping a zit...but gentler!)So we went out and got better a look. Lots of the feathers appear to be broken off. Almost like they were cut.View attachment 3766338 View attachment 3766336
In the meantime, a chicken saddle will protect the skin and make sure no one pecks the broken feather shafts - at least on her back. Also, if it gets cold, it will provide a bit of 'insulation' against the cold where her skin is exposed.
My 2 cents - I'm sure others will have some good thoughts on this, too.
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