Can you give us more information?
Do you have a rooster?
Is she able to use her wing?
What are you concerned about - the brownish feathers - is that blood or dirt - if blood from an injury - clean it up with some soapy water, apply a little triple antibiotic ointment to the wound.
If you are asking about the curved feather? You can leave it be to see if it straightens out. I can't tell, but it looks like it may be several feathers together and they might lose the sheath and look fine.