Shaved her face and it started to bleed and has black peaces of skin I guess

Why did you shave your dogs face?

I'm inclined to ask the same, what prompted you to shave her face?
Was it just for routine grooming or did you feel like you saw or felt something abnormal or saw some scabbing and dry crusty areas.
We really need a little more to go on.
Did you shave only her face what does the rest of her skin look like?