Ringworm is the main fungal infection cats get and it's fairly common in domestic cats, especially those with long-hair. The conventional view is that home remedies are ineffective, but that topical treatment (creams you get from your vet) must be applied relatively long term (3-6 months) to be totally effective, too.
Ask your vet about one of those cones thingies that go around the head to prevent her from scratching it fully (the thingie itself won't cost a lot).
I would consult your vet before trying any of the below, just in case cats turn out to be over-sensitive to any of it.
You could try all the usual home-remedies that people use on their own fungal infections: diluted white vinegar applied topically. Tea-tree oil or olive leaf extract (topical, both applied diluted).
Keep the area clean. There's controversy about whether it's worthwhile to shave the area; the main thinking is not to shave, as it seems to spread the fungus. The fungal spores can still infect the cat for up to 2 years after they were shed, so best to kill it on the cat, not let it spread.
Ask your vet about one of those cones thingies that go around the head to prevent her from scratching it fully (the thingie itself won't cost a lot).
I would consult your vet before trying any of the below, just in case cats turn out to be over-sensitive to any of it.
You could try all the usual home-remedies that people use on their own fungal infections: diluted white vinegar applied topically. Tea-tree oil or olive leaf extract (topical, both applied diluted).
Keep the area clean. There's controversy about whether it's worthwhile to shave the area; the main thinking is not to shave, as it seems to spread the fungus. The fungal spores can still infect the cat for up to 2 years after they were shed, so best to kill it on the cat, not let it spread.