@artyom: Her powers are almost sentient and there have ben a couple of instances where they have protected her but tge only one off the top of my head was when Hawkeye shot her and her powers basically revived her. Then Hawkey was erased from existence.
Wanda's hex powers act like auto-shielding. Scarlet Witch has some seriously low end showings and some god-tier showings (warping the fabric of the entire universe with a thought). She's more than capable of dispatching any Flash on a good day.
Flash easy. She has been routinely blitzed by way slower characters. Some random throwaway villain copying Quicksilver's powers was too fast for her and Flash runs circles around Quicksilver. SW would be broken as fuck if her powers probability powers were passive.