The wound itself doesn’t look to bad to me. I would remove more of the feathers around it to be safe.
You can also use stockinette to cover her wound.
You can get it online easily but some medical supply stores carry it.
https://www.backyardchickens.com/threads/yikes-large-wound-on-hen.1141144/#post-17736677
That link will take you to a thread about a girl of mine with a wound I treated.
If nothing else the pictures of how I used the stockinette could be helpful.
You can also use stockinette to cover her wound.
You can get it online easily but some medical supply stores carry it.
https://www.backyardchickens.com/threads/yikes-large-wound-on-hen.1141144/#post-17736677
That link will take you to a thread about a girl of mine with a wound I treated.
If nothing else the pictures of how I used the stockinette could be helpful.