She is the well-known protagonist Mathilde in "The Necklace". When the real necklace was returned, Mathilde traveled through time in a trance and became Agathe de Rastignac, yes, she became Eugene's sister in "Petro Goriot".
It's a pity that she doesn't know "Petro Goriot". She only knows that she suddenly became young and had more opportunities, and she was going to create a world in Paris!
Intention: Women's independence can also mean acceptance