Biki Anju (18), a class-x student of Chimpu Secondary School succumbed to her injuries.
She was sleeping when the landslide hit her dwelling.
More than five dwellings were completely damaged in the landslide.
Out of the three injured, one Bengia Nina's condition was critical.
Nina was being treated at R K Mission Hospital.
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"Though we cannot prevent a natural calamity from happening, we can minimise the extent of damage if we remain alert and take precautionary measures during the monsoon," Kaso said.
Arunachal Pradesh has been receiving heavy downpour for the past week.
Meanwhile, the Indian Army on Monday rescued 200 civilians, including 50 children.
The children were stranded due to massive landslides in West Kameng district, a defence spokesman said in Guwahati.
Heavy and incessant rain affected West Kameng district and multiple landslides occurred in Bomdila, Dirang, Singchung, Nafra and Kalaktang sub-divisions.
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