After the shooting, Washington and her other daughters noticed Jazmine was unresponsive.
"Of course they're shaken, they're devastated, they lost a sister", Razo said.
"It's our belief that it was totally unprovoked, whatever it was, and we're leaving no stone unturned".
The shooter is described as a white male with a beard in his 40s, driving a red pickup truck.
"You should have a heart and step forward and say you did this to this baby because she did not deserve what you did to her".
Police in Texas are seeking a white man who pulled alongside a black family's auto and opened fire, fatally shooting a 7-year-old girl. "We need our communities help", tweeted Gonzalez.
The sheriff said authorities don't have information that the gunman yelled anything to the victims during the shooting.
Thirty-year-old LaPorsha Washington told KTRK-TV from her hospital bed Monday that the man driving a red pickup sped up after firing into her auto, only to pull in front and slow down before firing again. Authorities are asking the public for tips and appealing to nearby residents and businesses to review surveillance video for the red pickup truck. "I could never imagine the day of losing one of my own children let alone the youngest of my 8 in such a selfish and sensless way (sic)", says the page.
"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.
Jazmine died at the scene, her mother suffered a gunshot wound to the arm and her 6-year-old sister was injured by shattered glass.
The Sheldon Independent School District said Jazmine was a second-grader at Monahan Elementary and "will truly be missed by all students and staff".
He urged the suspect to surrender. We will locate you. "We're extremely upset by this, and I know that our community shares those sentiments as well".