The lifeless body of the girl was found near Manikanedish High School in Ushat.
The victim was found in the Upesh Street area around 2 pm on Wednesday.
Uashat is an Inu reserve of about 1,500 people located in the MRC des Sept-Rivières on the north bank.
He was pronounced dead at Sept-All's Hospital. It will be an adult woman.
A security perimeter has been erected.
The Sûreté du Québec and local police are investigating together.
Forensic identification technicians were sent to the scene to clarify the circumstances surrounding the death. Guilt or voluntary action, neither hypothesis is ruled out.
They met the school students. A group prayer was held and classes were called off.
The SQ is awaiting identification of the person and inspection of the premises by other experts.
The Innu Council of Ushad Magh Mani-Uthenam expressed its condolences to the bereaved family.
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