Miesha Kilson says a Dallas police officer abandoned her as an argument with the father of her children turned violent on a roadway.
The incident with the officer began after an argument between Kilson and the father of children, Steven Douglas.
Police said Douglas rammed his car into Kilson's, ripped off the window and took his kids at gunpoint.
"I looked up, and I saw that cop car. It was at my window, and [the officer] leaned over his passenger window and said, 'What's going on?' And I said, 'Get him! Get him!'" said Kilson.
Kilson said she was on the phone with 911 asking for help when she said the officer stopped and then left.
"He turned and looked up at him and drove off, and I was on the phone with cops the whole time screaming 'Ma'am, a cop just left!'" Kilson said.
Dallas Police Chief David Brown said the department is looking into the allegations and, if true, finds them disappointing.
The Dallas Police Department confirmed dashcam video shows Officer Les Richardson at the scene, but police won't say what else is on that video.
Police said after the kidnapping, Douglas' mother met up with him and took the children to her home. Kilson, NBC 5 was told, left a voice mail as the chase unfolded, saying, "I love you. I love you, OK baby."
Police said Douglas led them on a chase toward Balch Springs. Moments later, officers said Douglas pointed a gun at them and was shot and killed.
Kilson said she wonders if the first officer could have stopped Douglas sooner.
"That was your job and you left me," she said.
Richardson is on paid administrative leave while Internal Affairs looks into the allegations. His attorney did not have a comment for this story.