I’ve washed it out with saline.
We sprayed with vetericyn spray.
We also have silver honey.
Welcome To BYCI’ve seen that you both are helpful with advice on care for injured chickens. @Wyorp Rock and @Eggcessive
Poor Girl!
It's good that you cleaned it and have applied ointment to the wound.
I'd leave it open, I would not wrap it or try to close it. Wounds like this are dirty even if you clean them well.
Hopefully this will eventually close up on its own, it will take time, there's a lot of fat exposed so it will take time for this to granulate.
I'd get some Chlorhexidine to have on hand just in case the wound starts to have an odor. Swab the wound, don't flush. With a wound like this. The skin is loose and anything to rinse with will accumulate down inside the skin.
Keep her separated out until she heals completely. Keep working on hydration and see that she's eating. Her neck will likely become sore and stiff, so placing her food/water up off the floor will be easier for her to reach.