Re: Scratching herself raw - how to stop?
It sounds like a possible allergic reaction to a flea or other bug bite. I would call the Vet and check on giving Benadryl. This will decrease the inflammation and urge to scratch long enough for it to heal.
Typically with ordinary bug bites (biting black flies that draw blood, etc here in NH) I can get away with a soothing topical, natural ointment. At times if the bites are near the eyes (or other sensitive areas like the belly/inner leg/ears) and the area around the eye starts to swell (or any red-looking and/or swollen area around the bite), I give Benadryl.
Hope she feels better quick!
Edit: I think it's common to give 1 mg of Benadryl per pound of dog. They come in 25 mg tablets, so for a 75 lb dog that would be 3 tablets per dosage (every 4 - 6 hours).