A man was killed when she hit him with the vehicle, according to police. The man's dog, who he was walking, was also killed.
Aerial footage showed the scene just after the crash around 4 p.m. Thursday.
Many questions remain as police continue to piece together what happened.
According to KTRK-TV, neighbors saw the man walking his dogs often. No one knows how or why the young girl was behind the wheel.
Witnesses said they even saw officers giving the 12-year-old a field sobriety test.
"They did her like she was drunk," one woman said. "We were wondering why they would do that test on her if she's just like a teenager. She's not supposed to be drunk or anything."
"That's the big question," a neighbor said. "I mean, for me, I would never allow my children behind the wheel of the car, especially not at that age. Very tragic for the gentleman and his dog to be hit and killed."
Houston police would only confirm that an investigation is ongoing. Neighbors said the young girl is back home with her family.
BREAKING: Houston Police tell me a 12 YO CHILD behind the wheel of a car on Beverly Hill Street hit and killed someone...I am on my way to scene. Lots of questions here obviously... Live report at 10 #Abc13— Stefania Okolie (@StefaniaOnABC13) August 16, 2019