Dellanna West O’Brien, the first international missionary to serve as executive director-treasurer of national Woman’s Missionary Union (WMU), died Sept. 7, in Frisco, Texas. She was 75. She suffered what WMU officials described as “a massive cerebral bleed” Sept. 4 after falling and hitting her head at her home. “Dellanna O’Brien is one of the most amazing women I have…