What do you learn about Adeline's real mother, her connection with Aunt Baba and her early death? (Chapter 1)

From the text:

“Your mama came down with a high fever three days after you were born. She died when you were two weeks old.…”

Big Sister once told me, “Aunt Baba and Mama used to be best friends. A long time ago, they worked together in a bank in Shanghai owned by our grandaunt, the youngest sister of Grandfather Ye Ye. But then Mama died giving birth to you. If you had not been born, Mama would still be alive. She died because of you. You are bad luck.”