Because the problem she had just experienced was one she had taken nearly a year to think through clearly.
It wasn't the kind of headless, tailless hypothesis of "if Senior Brother truly came back to life, whether she should return this position to him."
But deep, deep in her heart... she had to take on this responsibility, regard it as a burden, constantly hoping someone would come to help her; or whether she truly believed that she herself was the real root soul of Cui Yu.
Of course, she had already figured it out in the past.
But the so-called "Candle Sword" involved rekindling the answer she had discarded, which was not just another repetition of questioning; it expanded it in its entirety and doubled its power, making the holder truly pick up this choice from the heart.
Unless your candle flame is really tenacious and bright enough.