Help with Okatsu boss fight.

Any advice regarding Okatsu boss fight in 1st nioh? She's giving me a real problem with fightin her, shes fast agile and her combos are deadly, She easily closes and make the distance as well, just like on her whim, and in the matter of all failed attempt i gave to it I start running out of potions, and does not neseserly wish for doing additional potions grind for this fight, so if anyone have some usefull general or for dual swords user advices i would gladly listen to them, or if you want come help me yourself, as I tryied to do summoning, but saddly, 1st nioh player base is not as active nowdays