Grace L. Hewell, 89, a retired social worker and federal education specialist, died March 7 of congestive heart failure at Providence Hospital in the District. She was a resident of the District and Chattanooga, Tenn. Dr. Hewell was born in Chattanooga and graduated from Spelman College in 1940. After receiving a master’s degree in social work from Atlanta University in 1943, she enlisted in the Women’s Army...