Reborn: The Abandoned Girl's Journey from Darkness to Sunshine

Looking for a Novel Where the Female Lead Is the Biological Heiress, with a Fake Heiress and Brothers

I remember one story going like this: the heroine goes shopping for clothes with an older brother, then comes home and gives everyone presents. She gives the fake heiress a necklace. The fake heiress tries to hurt her, and the heroine takes the opportunity to fall down.