Isel is the only remaining heir of the Ravenclaw family, whose founder is Rowena Ravenclaw, one of the four founders of Hogwarts. In the Middle Ages, the Ravenclaw family had a high status. However, as time passed, the family gradually declined, and in the end, Iselle was the only one left in this generation to inherit.
When she was eleven years old, she originally thought it would be boring after entering Hogwarts, but she met Tom Riddle. Maybe it was a deliberate approach, maybe it was a sincere communication. The two of them were supposed to be parallel, but they intersected.
Isel, who had already fallen in love with Tom, knew that Tom was "lying to her": I love learning, Riddle, get out of my sight.
Tom: I was wrong sweetheart...
Purpose: Let the protagonist feel the warmth of home