You will probably have to wait until she is completely healed before you can put her back or they will continue to go after the open sores. Seems the rest just do not like her very much for some reason. I've had that happen, when there is one hen the rest just will not accept. The four I have, have been together for 6 years and they are not accepting the two I got in January, so they just stay separated. Tree Chick is now sleeping in the tack room with Cotton, both have gone broody and I NEED SOME FERTILIZED EGGS!! for them.