You can safely block the first (and second) flurry with a greatshield (or a high-tier medium shield). After that, dodging the rest isn't harder than dealing with any other attack in the game. She heals a bit from the blocking, but that should add just 2-3 R1s to the fight.There are a few, bloodhound step being the best. But if you're not using special ashes and relying purely on dodgerolls and movement... you're pretty much fucked. Yeah some asshole made a video of beating her hitless I'm sure but we all know he made like 50 attempts and only pulled it off because he killed her before she could attack more than a couple times.FUCKING BEAT MALENIA FUCK YOU GAME BRRLRRNRBBB
That three-part swishyswahsy attack thingy can seriously go fuck it-selskab right of the rectum. Is there even a reliable way to avoid it or do you just have to accept that RNG has decided to consume 2/3s of your HP bar and heal Malenia?
You can also stagger her out of the animation with status effects. It's easy to do it with bleed by just attacking and almost too easy with frost, since you can just throw a single pot (but it only works twice).