Sorry about your chick.
Is that bone sticking out? Which bone is it? Can you tell, is it for sure from the wing?
Trimming around it so you can see it better is a good idea.
Exposed bone can have infection set in and likely if it's skinned, the skin will not regrow and cover that, so I'm not certain that wrapping the bone is going to help.
I wouldn't cull unless the chick has other injuries and is failing. Any other wounds/punctures?
Hard call. IF you can trim the bone to where it will be covered by skin as the chick grows, that may be best. She's young, so the bone will be relatively soft.
Cutting at the joint is another option, but it may be a little harder to heal up.
Vet care is the best option of course.
Do you have an antibiotic on hand? She may not need it and she's SO young I'd hesitate to give antibiotics, but having something just in case is a good idea.
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