Celina Cass had been missing for almost a week. She was last seen on Monday at her home in Stewartstown, which is about a mile away from the Canadian border.
Divers found her body late Monday morning near a hydroelectric dam that spans the Connecticut River between Stewartstown and Canaan, Vt., and removed it from the river Monday evening, said New Hampshire Senior Assistant Attorney General Jane Young.
"We have brought Celina home, obviously not the way we wanted to bring her home," said Young, her voice breaking with emotion.
After a dive team searching the river surfaced, investigators blocked off the area and asked reporters to leave.
An autopsy was scheduled for Tuesday to determine the cause and manner of death.
The Associated Press contributed to this report.