Please Help.. She is getting worse, looked like Vent Prolapse

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I've never seen anything like that.

My best guess would be either someone trimmed them off( I know you mentioned a predator, but, they tend to grip onto the feathers hard and directly pull them from the base, still a possibility, I suppose). Or it could possibly be a nutritional issue which is causing the feathers to be depleted of nutrients and are breaking off due to brittleness, or maybe it's related to an ectoparasite infestation.

That brings up the few apparent questions, of what you're feeding them, have you checked them for mites/ or lice focusing around the vent area, have you had any problems with the birds fighting each other, or predator problems in your coop, and if you live in an area where kids or immature adults go into coops and trim off feathers for fun.

@SilverFoxRanch Sounds like some good advice.
I hope you can help her and she recovers... she is the cutest looking little thing (even though she’s poorly)!

Totally agree

 

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Totally agree

Sorry that other quote is about my chickens