How did Elizabeth come to live with the frankensteins?

I believe that Victor's mother asked the peasants she lived with for permission to raise her earl yin the story. She was adopted In southern Italy by Caroline Frankenstein.

Elizabeth is adopted by Alphonse and Frankenstein when she is five from a family of poor Italian people.

Sorry, that's Alphonse and Caroline Frankenstein.

How does Elizabeth come to live with the Frankenstein's?