Are you trying to make it look deliberate? I mean, obviously the girl's not a rocket scientist but it seems evident this was unintentional.
It was deliberate and intentional. She had no daycare, so leaving the child in the car was intentional.
Since many of these cases involve children who were enrolled in, and regularly attending daycare, there’s no basis for your claim. Harried parents who aren’t getting enough sleep strap their kids in the back seat because they are required by law to that, and then along the way think they’re on their way to work after dropping the child at daycare, just like they’ve done every other morning. Nothing to notice while driving or getting out of the car, because the child isn’t in plain view next to the parent.
What do you mean “she had no daycare?” If you read the article you will see that she dropped the boy off at daycare the day before but this day for some reason she did not. Perhaps she had her head in the clouds and just forgot?