Oh didn’t know you already did it. If you want tips, for waterfall dance seek guides ore use a shield/ if ok also block with the weapon you using. First block, then rolling gets easier for the following two attacks. What me helped pretty good, if you are light weight, it’s way easier to dodge most of her attacks in time without perfect position ore timings. Don’t heal when she doesn’t do anything, only out of range while she doing her combos. Ore if your damage is high enough, training. Keeping her staggered while trying to predict her waterfall dance.
No problem. What I learned later after her is the high value of passive healing. With the serpent hunter curfe sword (can be in offhand) allows you to heal yourself when hitting. Can be used without using the weapon, just offhand is needed. Then the blessings talisman + bestial vitality you heal 7hp/s. Keeps helping if your damage is low and struggling with healing, ore get max hp buffs active.