She might have internal injuries, but treat for shock just the same. Get her drinking fluids with the electrolytes often for a couple of days. Mix chick feed with a little water to moisten some. Offer both the moistened and some dry. Oatmeal is not good alone. Make her a chick sling chair to get her upright and close to food. Let her out often to rest or sleep at night. Clean the wound with the wound spray or saline. Apply the antibiotic ointment twice a day and leave open. Raccoons are the ones that usually pull chickens through chicken wire part by part. Get some 1/2 inch hardware cloth wire at the big box store or online, and cover the chicken wire to make it predator proof. So sorry about your chick. I hope it makes it. Here is a good link about chicken slings with good examples on the first 2 pages:
https://www.backyardchickens.com/threads/versions-of-chick-chairs-please.1166308/
https://www.backyardchickens.com/threads/versions-of-chick-chairs-please.1166308/