What is this

Greetings from Kansas, icegirl, and ! Pleased you joined our community! Your diagnosis is correct - those are the tell tale signs of feather loss caused by a rooster. There are remedies....the most extreme is eliminating the rooster. But there are also chicken saddles that protect the hen's back as well isolating the rooster from the hens.
Here's a link to old threads that discuss saddles: https://www.backyardchickens.com/newsearch?search=chicken+saddle
That and other info can be found in the Learning Center here:
https://www.backyardchickens.com/atype/1/Learning_Center
There are tons of great articles spanning the range of chicken keeping.
And if you'd like to chat with some local poultry folks, find your state (if you're in the U.S.) thread in the link below and say howdy:
https://www.backyardchickens.com/t/270925/find-your-states-thread
I wish you the very best and thanks for joining BYC!

 

This looks like it is at the back of her.. she could be getting pecked by the flock because she is on the low end of the pecking order in your flock.. @redsoxs glad you attached direct links.. so much fabulous information on here..

 

G’Day from down under icegirl1312 Welcome!

As you have already received some good advice from redsoxs and links to some great starting points, I will just wish you and your flock all the best.

I hope you enjoy being a BYC member. There are lots of friendly and very helpful folks here so not only is it overflowing with useful information it is also a great place to make friends and have some fun.

If you would like to share pictures and stories of your flock, you have come to the right place. BYC’ers never tire of these and do not back away slowly or commence eye rolling when the photo album or home videos come out

 

Thanks for joining us!