DeX 43, Int 60, Fth 40, swamp ring, witch ring, bellowing dragoncrest ring, young dragon ring. Use only great deep soul repeatedly in first phase, it'll interrupt her combos, track her ninja *** and usually clip her and bring her out of invisibility as she starts, if you keep up a steady barrage. Keep your distance and keep up the pressure and the phase is easy. Phase 2, sidestep Ariandel when he charges and lob black fire orbs at his side. Just keep an eye on Friede. Phase 3, repeat phase 1, but only fire after her combos. Keep your distance, roll sideways to avoid the frost and flame, and you'll be fine.