DALTON, Ga. — On a humid evening in August, Nancy Davis Womac paced anxiously on her front deck. Her hands trembled as she stared at a text message from her firstborn daughter, Melanie Spencer, saying that she was minutes away. The two had never met. Forty-three years ago, Womac was pregnant and living in an orphanage when she was sent to the Bethesda Home for Girls on the outskirts of Hattiesburg, Mississippi. It was run by Baptist preachers who forced girls to memorize Bible chapters and scrub carpets by hand. Staff members beat the girls with wooden boards if they...