Investigators say the driver of the pickup, described as a man in his 40s, fired into the vehicle, striking Jazmine and wounding her mother, 30-year-old LaPorsha Washington.
According the Harris County Sheriff's Office, a woman was driving out of a store parking lot near Wallisville Road and Beltway 8 when a man in a pickup truck pulled up next to her vehicle and began firing inside.
Washington said: "He sped off in front of us and stopped, and still continued to fire at us". It was not fair. "And as a man, you should step forward and take full responsibility for what you did to my child", Washington said.
Authorities said three other girls were in the vehicle when the shooting happened.
Washington said one of her daughters discovered Jazmine had been shot.
"She said, 'Momma, Jazmine's not moving".
The 7-year-old girl was identified as Jazmine Barnes by authorities.
The family has set up a GoFundMe page to help with expenses.
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Heartbreaking news surfaced as reports of a 7-year-old girl being shot to death in a Walmart parking lot surfaced.
The younger girl suffered glass fragment injuries and the teens weren't hurt, but they were "shaken" and "devastated", said Jesse Razo, a major with the sheriff's office.
Authorities are still searching for the gunman, described as a bearded white man, possibly in his 40s.
The red pickup fled the scene after the shooting.
"The family should be celebrating and spending time together anticipating the new year and instead they're making plans to bury this innocent, precious child", Gonzalez said.
"And I urge you, whoever did this, you know who you are, please turn yourself in now because we will be looking for you, we will locate you, we will find you", he said.
It wasn't clear what triggered the shooting.