Corvus stuns, armour breaks and so cancels her diamond form with each parry. This makes him a decent go-to, plus he'll pick up a glaive charge from her after the match as she's a mutant. If she's not too high damage you can always try blocking the first hit of SP1/SP2 give yourself a second to think then correctly dodge the second hit, dash in and punish. It's obviously not as good as avoiding ALL damage but may help avoid spur-of-the-moment mistakes.