only certain types of maggots, raised in labs for medicinal use, trained thru genetics to eat only dead or gangrenous flesh, and free of micro-organisms, are used for wound therapy.
naturally occuring maggots eat dead and live tissue, and also cause a certain infection..Myiasis...
so..please stop posting erroneous information about maggots.
it's imperative to get rid of them asap.
Following the suggestions of "three horses"..
Please do your best to help the hen and try to get rid of as many of the maggots as you can..
it's possible they are near the surface, and if you act quickly..she might be saved..