So she traveled through time and worshiped Jin as her teacher.
What a coincidence, she took away someone else's child, even though the child's father was Chrollo Ruxilu.
Okay, she is a child with a bit of an Oedipus complex and is determined to kill her father, her love rival, when she grows up.
To put it simply, time travel, cross-dressing, knowledge and cup.
The heroine is not omnipotent, but she will grow and become stronger. The heroine is not a virgin, but she will care about the people she cares about.