The girl appeared at a court hearing with her 17-year-old sibling, who was sentenced to two years for sexually assaulting a minor.
Fighting broke out on July 11 between soldiers and Ta'ang National Liberation Army (TNLA) insurgents near Awelaw village in remote Shan state near the Chinese border, both sides confirmed.
Wa Lone, 32, and Kyaw Soe Oo, 28, face up to 14 years in jail if convicted under an official secrets law of possessing classified documents about security operations in Rakhine state.
Hong Kong is governed under a "one country, two systems" principle which promises it a high degree of autonomy and freedoms not enjoyed in China, such as the freedom of speech and freedom of assembly.
Myanmar nationals Wa Lone, 32, and Kyaw Soe Oo, 28, were arrested in December and accused of possessing documents linked to security operations against Rohingya militants in Rakhine state.
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