There are suppliments you can get to put in her food....but I would be sure it is actually just dry flaky skin before doing anything. Sometimes ringworm can appear as just dry flaky skin instead of its usual red patch of dry skin with no fur.
There is a topical spray thats called "Relief" made by DVM Pharmaceuticals that is oatmeal based that helps dry skin. They also make a product called "3V caps" which is a capsule you can squeeze on the food daily. Im not sure if either of these is labeled for cats, but I know they do not say not to use them on cats. Ask your vet....I think the 3V caps would be fine. They just have amino acids, fish oil, and vitamins in them. Unfortunately, there's not a lot of things to chose from just for kittys...everything skin- wise is for dogs it seems.
....Im looking at my bottle of 3V and I see nothing that says not to use it on cats, in fact it doesnt even say dog specifically....it says "pet"...so it would seem that its ok for all pets. It works wonders for my dogs, should work just as well for cats.