Is the skin red, scabby, wet, puffy?
If the skin looks healthy then it's JUST the weird shedding that's going on. Don't freak out, watch it for a day and go from there. What color is she, color of skin? Look for tiny
hairs sporadically growing in the bald areas.
My bay gelding "patched out" and HIS FOREHEAD went BALD! Two days later it was all grown back in. My grey looked like he had scabies on his flanks, scared me to death. Upon closer inspection I found the tiny white hairs growing back in. He has HUGE chunks of thick hair clumping off and he's not to happy with me messing with his bare skin, I believe it to be a little sunburned.
Watch it and it's probably just par for what's going on!