No mounting. Just molted in the fall, so I don't think she'd be doing it again.
How is your girl today? I'm kinda stumped on the feather loss on her back with no roo...maybe they cornered her and she put her butt down and they went into a feather picking frenzy on her back? Idk, I would expect to see peck wounds, rawness or even blood if that was the case. I'm still thinking bugs really or, a double molt or, a stress molt if she is being deprived of food by others or was having some issue that was very uncomfortable that led to the prolapse. (crop or egg laying problems). She may have internal parasites that are draining her of nutrients so that after her molt her feathers didn't grow in right. I'm trying to think of any thing I can to help. Guess I'll go do some research....
I found this, it's worth considering, can you observe your flock for several hours including into roost time? http://www.hobbyfarms.com/livestock-and-pets/chicken-feather-loss.aspx
Here's another good article http://www.yourchickens.co.uk/care-and-advice/lowdown_on_feather_loss_1_3746383
To summarize, any sudden change to environment or lighting, super aggressive hens, lack of proper nutrition, (especially protein) causing illness, space issues and parasites should all be under consideration as causes of feather loss.
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