sprintmaster and stable body is a must for me.. sprintmaster gave me easier time to dodge the fireballs during all phases and stable body so I can get those sneaky hits and avoid falling due to knockbacks in the second phase.

First phase nothing special there just avoid and always be on your toes for possible daggers coming from the sides. (just dash on the spaces to be safer unless you don't need to jump) You should be able to perfect this hitless if you managed to beat pure vessel

Second phase just stay at the center bottom . You should only hit her when she spawns at the three locations near you (left, right,center) get a last second hit and abyssal shriek combo just after avoiding her swords and light beam attacks. When she spawns after you is a perfect time to heal up right after she tosses her skills.

third phase: heal as much as you can at the center bottom before going up. Just go. Its better to tank getting hit once or twice going to the top than having second thoughts jumping and end up losing more life.

fourth phase: Just delay your jump to only when the fireball is near you. (take note of the summon time, only dodge when it is going towards you and not while being summoned) This will prevent it from recoiling back and it should go off-screen. Take your time here. Just stay on one side if possible and jump hit and spam soul shade when she is on the other side.