how to bandage a wrecked neck
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I think she will get it in due time. Just make sure any ointment you use has NO painkiller in it. Chickens react badly to ointments with pain killer in them.
You can use non sticky gauze and vet wrap just keep the bandage loose so it does not restrict the neck movement. (or cut off circulation of course)
She may have some additional injuries that are not visable. Have you isolated her so you can keep a close eye on her? If she is isolated then perhaps if she is having issues while the bandage is on it could come off.
How deep is the wound?