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The antibiotics won't hurt her if it's not an infection and she will get worse without treatment, unfortunately.

https://www.backyardchickens.com/threads/need-help-with-hen-with-a-possible-reproductive-tract-infection.1499118/#post-25045762 This thread has info if what your hen has is indeed an infection, but it usually only prolongs their life but it will likely come back.

You can try fish antibiotics but reproduction issues rarely get better, she looks like some sort of sex link, they are prone to reproduction issues and rarely live longer than 3 years due to that reason.

What breed? She may have a reproduction infection or issue.