chickluvinfreak
Songster
If she is in the coop with other hens it maybethem who are plucking at her tail...it isn't unusual for non-broody hens to pull on broody hen's feathers to try to get them off of the nest so they can lay their egg. If she happened to be in the box in a position that put her tail in reach then that could have gotten the plucking.
Molting is also a viable explanation, I have had hens molt while brooding...
Thank you for your help. She is second to top of the pecking order so im not sure if any chickens would have bothered her. But it is possible since she doesn't move for anything when shes broody. I have a feeling she may be molting. Her overall appearance has just been raggedy looking. Thanks again