HOUSTON -- Cold temperatures have family and searchers concerned about the well-being of a missing Fort Bend County girl, KPRC Local 2 reports.

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Video: Classmates Write Letters Of Support

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An Amber Alert issued for Teketria Buggs, 12, at 8:13 p.m. Sunday remained in effect Tuesday, after temperatures in southeast Texas dropped to the low 30s.

Teketria known by friends as Teeky Bugg, was last seen asleep on a couch at her home in the 9000 block of Johnson Road in Orchard late Friday night. She was reported missing at about 10 a.m. Saturday. None of her belongings, including a jacket, had been taken from the home.

On Monday night, Teketria's mother told CNN's Nancy Grace that she thinks someone Teketria trusted might have taken her.

Texas EquuSearch and the Fort Bend County Sheriff's Department widened their search Tuesday morning near Teketria's rural home and asked for help from the Texas Department of Transportation.

"They are going to help us, being guides. They know the ditches, and the bridges and the culverts," EquuSearch founder Tim Miller told KPRC Local 2.

Dive teams searched the Brazos river Tuesday afternoon. Miller said divers are searching several areas of the water where sonar equipment detected something.

Miller said searchers would use remote control airplanes, high-vision scopes, 4-wheelers and Sonar to search more than 12 acres of heavily wooded land and the Brazos River near her home.

"I don't see where there is to go. We understand she's scared to death of the dog. She won't even go to her aunt's house, which is right next door, when it was dark. So for her to take off and go to some place on her own, I think that's out of the question," EquuSearch founder Tim Miller told KPRC Local 2.

Authorities said Teketria appears immature for her age but is an A-B student at school. Her classmates at Brazos Elementary School wrote hundreds of letters of support to volunteer searchers.

"We miss her so much. You and her are in our thoughts and prayers. Our prayer is that she is found quickly and safe," a teacher read from one of the letters.

Teketria is a black female, about 4 feet 10 inches tall and weighs about 95 pounds. She has black hair, brown eyes, and light brown skin. She was last seen wearing a red and white long-sleeved pullover shirt, blue jeans and white tennis shoes.

Investigators said they have not ruled out foul play and that her disappearance remains under investigation.

Anyone with information should call the Fort Bend County Sheriff’s Office at (281) 341-4665 or Fort Bend County Crime Stoppers at (281) 342-TIPS.