User blog comment:Ncduru/The Erza-Irene Connection/@comment-207.45.155.253-20160425130814/@comment-4.31.137.194-20160425141925

How about if Erza is actually from Alvarez? What if Eileen has been dreaming of becoming a spriggan since she was a child? Then she got pregnant and thought that the pregnancy or having a child will hinder her dream of being a spriggan, or Zeref was against her pregnancy, so that's why she shipped Erza to rosemary village.