After you wash your hands use lemon scent hand sanitizer on them before picking her up. Between the sharp smell and the cooling effect from the alcohol in it, she may leave your hands alone.
Otherwise keep a small container of white vinegar in your snake room. When you get a food bite, a drop of it rubbed on your snake's nose will break the food response; it even works on my retics. Sometimes just the smell of it is enough if you rub some on a finger on your other hand and get it close enough to your snake's nose so that it gets a good whiff of it.