HOW TO BEAT RENALLA THE TWIN MOON KNIGHT?

I AM AT MY ABSOLUTE LIMITS. Wtf is that boss. What is the viable build to beat her. I Need something here. I am using curved swords but they dont seem to do anything? The damage is also abyssmal need tips
 
I'd say use Katanas with Bloodflame incantation. Bleed Proc her for high damage. Its a battle of who kills who first literally. Be on offense and take her out as soon as possible. Delaying it will lead to disaster.
 
I have also been trying with my greatswords but she seems unbeatable by heavy weapons. What a frustrating boss
 
I used the new Great Katana and it worked surprisingly well against her. Imbued it with poison as well. Renalla is extremely susceptible to poison and I'd recommend you doing the same