Since she speaks a rather obscure Spanish dialect, and is likely from a rural part of Latin America, where she lived they probably didn't use child restraints at all.
Culture plays a part, that's for sure. Remote places not centered around a vehicle based culture are not going to turn out people savvy in car crash dynamics. Ironically, understanding the target culture can also be the best way to educate about car safety. If you can find a way to relate car seats to a well established custom, the change in mindset then becomes minimal. A very successful example of this is the "Cradleboards to car seats" campaign.
Lifestyle is also a stumbling block. Those living a life where starvation and homelessness is a real possibility, are not likely to be open to car seat safety education. They can't even process it. Food ans shelter are at the very top of the hierarchy of needs. If you haven't eaten and you don't have a safe place to sleep, nothing else matters.
Culture and lifestyle are both a piece of the puzzle, but I think the biggest challenge we face is quite simply evolution. I'm not saying that in a mean "Darwin award" type of way either. The world as humans experience it has changed faster in the last century than it ever has. Biologically, we are still hardwired to be wary of predators. Cars are not alive, so are brains don't see one and send off warning signals. We get in that sturdy box and move quickly and that IS SAFETY in a world where getting away quickly is the main defense for prey. In that world, being restrained is being defenseless. We are not made to go as fast as cars take us. The result of that speed does not compute on the instinctive level. We can override the hardwiring through education much the same way you can load software to change the way a computer works, but it takes time. Generations of time. We can tell people people that cars are dangerous, but some we are not going to reach. They are still looking for the lion in the grass. They are not ready. That's OK, tell them anyway. The next generation is listening too. They are the ones that will see the news stories and the "it happened to me" stories, put it together with our message, and realize that car travel really is the lion in the grass in today's world.