User blog comment:D.Ryan/Is Eleanor Lamb really the big sister ?/@comment-1732397-20091212150029

prehaps, eleanor didn't come back to Rapture to restart the ecology, but to save the remaining Little Sisters in Rapture. However her mother Sofia Lamb has already turned the Little Sisters into the Big Sisters. So now she is trying to help everyone she can to escape Rapture including the player Subject Delta.