Yep, still sounds like it could be ringworm to me too, which is of course a fungal skin infection.
Sometimes by the time the scrapes come back, it's cleared up if it's been treated as such. When Sunny had it he was treated with a wash and griseofulvin which cleared him up pretty quickly. My vet said it will resolve by itself anyway, but it takes weeks and in the meantime other horses could get infected. As it happens the whole yard had it, Sunny was one of the last to get it, but it was misdiagnosed by the others' vet and no precautions were taken to stop it spreading, so it wasn't a surprise really.
Hopefully if it is a fungal infection the wash you've been given will clear it up. Have you been asked to keep her gear and grooming stuff separate just in case? I had a bucket of Virkon outside the stable to wash with.