The article implies, but does not say if the child was in a car seat.
Depending on the vehicle and its age, the woman may have thought that the transmission was in park. The linkages on old automatic transmissions can get sloppy and not fully engage, or partially engage and slip out.
It may be that she was removing the child (from a child seat) and once the child was in her arms the trans slipped out of park and began rolling back. The child may have been dropped as she tried to stop the car from rolling or was struck by the open car door as it rolled back, or both. We don't know and the article did not say.
The facts as reported do not support your statements. You may want to reserve judgement till more is known. the woman deserves the benefit of the doubt.
Good point. From the article linked on the thread it looks like a recent model of the Jeep Liberty.
I am reserving judgment, but the child is dead and there should be a thorough investigation.
The little guy and his dad deserve nothing less.