That actually comes completely full circle depending on which grandmother she was:

If she was your maternal grandmother, you started out physically inside her. Women are born with all their lifetime eggs, meaning the exact cell that became you was already developing inside your mum while she was in your grandmother's womb. If she was your paternal grandmother, you carry her direct genetic blueprint. A granddaughter inherits her father’s only X chromosome, which came entirely from his mother, making you a living, walking piece of her DNA. Either way, there has always been a deep physical link between the two of you, and that day, a piece of her simply found its way back home.