Her husband was arrested in the Burmese coup d'état in March 1962 by the Revolutionary Council headed by General Ne Win and one of her sons, who was 17 at that time, was killed in the military coup, apparently the only casualty on the day of the disturbances. She fled with her family to Thailand in October 1963 after her husband had died in prison in November 1962. While in exile she participated in the independence struggle of the Shan State. In 1964 Sao Nang Hearn Kham, together with her son Chao-Tzang Yawnghwe, helped to form the Shan State War Council (SSWC) and the Shan State Army (SSA), becoming Chairwoman of the SSWC.