Catching the point as splendidly as only Ani can. It doesn't matter if it's 2, 3, or 4 - all of them will panic sooner or later when they notice they can't see their mom (or dad) anywhere.
Nah, and I won't even deny that if you push a kid out of the airlock in space, something bad will happen. Mentioning particularly the street is irrelevant. Especially since the video showed some bloody backalley or whatever, certainly not a proper street with cars driving 40-50 km/h. So, for all we know, the kid might have escaped from indoors. In any case, if we start from the Western tradition of assuming not guilty unless proven otherwise, then it's plausible to assume the parents didn't let the kid to wander the street alone. She simply ended up there in some manner that will remain unexplained forever. Just like a few people here claim the parents did too little to ensure she was safe, it's also possible to claim somebody else did too much to make it possible she wasn't. Like open a door the parents thought would remain locked.
Still, I admit there's a reasonable chance the mother will bear real responsibility by having been negligent. We will never know.