From the KARE-11 website:
Sartell police are asking for the public's help in locating a woman who has been missing since Monday, when she left her parents' home after an extended argument.
Andrea Alejandra Arriagada, 18, left her parents' Sartell home at about 5:45 a.m. Monday and said she was headed to St. Cloud State University, where she is a student and member of the biathlon club team.
She never arrived there, and her parents reported her missing at about 11:20 a.m. Monday, said Deputy Police Chief Dale Struffert.
The family's 1999 green, four-door Toyota Corolla is missing, Struffert said, along with a .22-caliber rifle. The license plate on the Corolla is Minnesota plate DSZ 142, Struffert said.
It's unknown whether anyone was or is with Arriagada, he said. Anyone with information about her whereabouts is asked to call the Sartell Police Department at 251-8186.
The link above includes a picture of her. Other reports state that she has friends at other MnSCU institutions that she may have contacted (which is why I posted this here).