I definitely struggled for a hot second but then I downloaded this bitch.
She dies in 4 knockdowns and the first one is completely free for some reason, just dodge red arrows and walk behind her, then get another one off a dive just like with Bo Sorcerer. In phase 2 she explicitly attempts to negate that tactic with arrows preceding dive but you can get a fairly easy backshot when she does red blades combo, if you dodge the third slash (with the wave) to the left she's exposed for a very long time.
Good boss ngl