The mother of a 6-year-old girl died in a crash along Texas Highway 249 late Monday night.

The girl’s father was driving southbound on the feeder road near Lakewood Crossing around 11:45 p.m. when he lost control and careened into a light pole, according to Harris County Sheriff’s Office Sgt. Simon Cheng. They were the only three people involved in the crash, Cheng said.

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A good Samaritan ran from a nearby business to help get the girl out of the car, who had become trapped in her car seat.

“I spoke with the little girl. I told her my name and told her I was going to help her,” Lindsay Carlen said. “She told me her name and how old she was. She trusted me.”

Carlen told investigators she helped pull the child from the mangled wreckage as she called 911 for more help. Paramedics airlifted the girl and her father to a hospital, where they both were expected to survive.

The mother in the passenger seat was pronounced dead on scene, Cheng said.

The driver showed signs of impairment, Cheng said. It is unclear if he was determined to be intoxicated, although Cheng said investigators are still working to determine if he will be charged.

Jay R. Jordan covers breaking news in the Houston area. Read him on our breaking news site, Chron.com, and our subscriber site, HoustonChronicle.com | Follow him on Twitter at @JayRJordan | Email him at jay.jordan@chron.com