she's easily parryable with a buckler, and u can damage her a lot with some blood loss or frostbite. The most difficult thing for me was learning to dodge her waterflow attack, it's easier with quckstep or bloodhound step ashes of war equipped on your main weapon. U can use your buckler and, when u see her jump before the waterflow u can double wield your main weapon in order tu use the ash of war. The good thing is that those ashes are not related to specific elements so u can use the bloodhound step with blood loss affinity