( CNN ) -- A New Hampshire teen who disappeared nine months ago is back home , the state attorney general 's office said Monday . Neither the teen 's family nor authorities offered any information about where she was during those months . The disappearance of 15-year-old Abigail Hernandez , who vanished on October 9 as she headed home from her high school in the town of Conway , according to the FBI , triggered nationwide media coverage and concerns by authorities then that she might have been abducted . At a news conference in December , New Hampshire Associate Attorney General Jane Young said the teen `` is not out there alone . She has somebody who is either helping her , whether that be a friend or what we fear is a foe . '' At that news conference , authorities revealed that Abigail 's mother had received a letter that appeared to be from her missing daughter . Although authorities did not reveal the contents of the letter , Young said `` we believe in fact that it was written by Abby and was sent to her mother . '' Despite the concerns , her case was classified as a missing persons investigation during the months she was gone . Abigail was safely reunited with her family Sunday evening , according to a press release from the attorney general 's office . Citing an ongoing investigation , authorities did not release any information about Abigail 's disappearance . Her mother , Zenya Hernandez , told law enforcement officers that `` today we are the happiest people on earth , '' according to the press release . Remains found in Mexico identified as those of missing American . Marine 's wife disappears at national park . Police : Michigan boy 's basement case to go to prosecutors . CNN 's Leigh Remizowski and Julia Lull contributed to this report .
Fifteen-year-old Abigail Hernandez had been missing since October . After her disappearance , officials feared she might have been abducted . She was safely reunited with her family Sunday night . Neither the teen 's family nor authorities gave details Monday about her disappearance .