Poor thing, that is pretty serious. Take her to ONLY an experienced reptile vet, one that is very familiar with beardies. Otherwise you will waste your money. Let them do a skin scrape , better yet they can just gently snag a small piece of the flaky part so as to not cause more pain + stress.
Other than that , the other 2 posters gave great advice. Get her off the sand ASAP, it will stick and irritate the wounds. And the antifungal cream can be Lamisil or Monistat as well as raw, unpasteurized honey that can kill most bacteria or keep it from growing + spreading. BTW, can you post more pics in better light ?