A good Strat for the chalice dungeon one is to ALWAYS keep moving, and ALWAYS keep her in the middle. If you see her walking toward you, run behind. Run in front of her quickly and bait the stretch attack, and spam away at the arm. Phase 2 is essentially the same. Phase 3, as she's ripping her arms off, run toward her crotch and slam at its tail or crotch. If she jumps, run to where the tail was before she jumped, this should let you punish over and over, essentially locking her in that state. I had 50 VIT, 40 STR and 50 SKL. With LHB or Burial Blade, use L2 to bait the jump attack in phase 3 and deal damage to that one sweet spot at its chest.