SPANISH FORK, Utah (AP) -- Police say a baby who spent some 14 hours upside down in a car seat in freezing temperatures after her mother crashed their car into a Utah river is improving and expected to live.

Spanish Fork police Lt. Matt Johnson said Monday that the family has told him 18-month-old Lily Groesbeck is doing better. She was discovered midday Saturday by a fisherman in Spanish Fork after police believe her mother struck a cement barrier on a bridge and careened into the river.

Her mother, 25-year-old Lynn Groesbeck of Springville, was found dead in the car.

Rescuers at scene of car crash in the Spanish Fork River in Utah Sunday. (AP Photo/The Daily Herald, Sammy Jo Hester)
Rescuers at scene of car crash in the Spanish Fork River in Utah Sunday. (AP Photo/The Daily Herald, Sammy Jo Hester)
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Johnson said police don't know what caused the accident late Friday night. He says there were no skid marks or signs of mechanical failures in the car. No one saw the wreck.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

An 18-month-old girl whose mother crashed their car into a Utah river survived hanging upside down in a car seat for some 14 hours in freezing temperatures before a fisherman found her, authorities said.

The mother, 25-year-old Lynn Groesbeck of Springville, was found dead in the car, and her daughter Lily Groesbeck was in critical but stable condition at a Salt Lake City hospital, police said Sunday.

"She is doing remarkably well considering the circumstance. The doctors have been hopeful so far," the mother's sister, Jill Sanderson, told KSL-TV of Salt Lake City on Sunday. "We would like to express our appreciation to the Spanish Fork rescue team for saving the baby's life."

The fisherman discovered the car on its top in the Spanish Fork River about 12:30 p.m. Saturday in Spanish Fork, about 50 miles south of Salt Lake City, police Lt. Matt Johnson said.

Investigators believe the wreck occurred about 10:30 p.m. Friday, when a resident near the accident scene reported hearing a noise, Johnson said. The resident could not find anything unusual when checking the area.

The girl was found hanging upside down above the river that flowed through the car, and the water never reached high enough to touch her, Johnson told the Deseret News newspaper. Her mother was found in the driver's seat.

The car struck a cement barrier on the bridge and careened into the river, investigators said. It landed under the bridge and was difficult to see from the road. Police are not sure why the car left the road, and the Utah Highway Patrol is assisting in the accident investigation.

Family members told police that Lynn Groesbeck left her parents' nearby home in Salem about 10 p.m. Friday and was heading to her home near Provo when the crash occurred.

She was enrolled at Provo College with a goal of becoming a medical assistant, Sanderson said, and had lived in the Provo area her entire life.

"She was very compassionate and a very loving person and always willing to bend over backwards for her loved ones," Sanderson told KSL. "Her baby was the love of her life. She was an amazing mother."

Three police officers and four firefighters who entered the river to push the car on its side and rescue the girl were treated for hypothermia at a hospital and released.

The temperature dipped to the low- to mid-30s overnight while the girl was trapped in the car.

Police said they wouldn't release further details Sunday unless the girl's condition changes.

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