Edith Eva Eger, a clinical psychologist and bestselling author whose traumatic experiences as a prisoner in Nazi concentration camps — including being forced to dance for Josef Mengele, the notorious physician known as the “Angel of Death” — enabled her to identify with and treat emotionally troubled patients, died April 27 at her home in San Diego. She was 98. Her daughter Audrey Thompson confirmed the death. Eger became a psychologist in her 50s, after immigrating to Baltimore, working in a clothing factory, raising her children and returning to college. Her emotional recovery took time: For two decades after the war, she did not discuss the privations she had endured or the atrocities she had witnessed. The buried memories stalked her nightmares. She learned that she had to forgive herself for surviving — which she barely had.…