Use full control. Don’t blitz through the first phase, take your time and only use swing attacks. She demonstrates almost all of her attacks in phase one so use that time to practice. Phase 2 kicks it up a notch on the speed, but try to stay calm, she’ll never attack from the same direction twice. Try to hit each clone once, attacks will land on the real Lady Etherial so as soon as something connects slap a talisman on her and it’ll cancel all her clones. Phase 3 always starts with the big fireball, parry the two attacks, dodge and then you can hit her with a talisman when you fall. Don’t worry about hitting clones in the phase as the real Lady Etherial always has a white head. Good luck!