The wound may look awful one the dead tissue sloughs off, but if it is nice and pink/red then that's GOOD! She is young and will heal up. Ask your vet if it is possible to use a silver-impregnated topical gel on the wound. Silver is a natural antibiotic and works wonders in human wounds, and...
I had a holistic vet until recently, and she made her own herbal tinctures. She suggested EVO dry cat food (no grain) and yam & marshmallow (the plant - not the candy!) herbal tincture (stabilized in alcohol) for my cat Lydia. I call it her cockctail. She gets a syringe with 0.4 ml BID, only...