Neither of these links work for me, 404's etc. But given that the source seems to be San Diego, and I lived 6 years in San Diego-- I'm skeptical that this is a fair comparison, as the weather is so completely and utterly different. Unless this was far inland in what we used to call "H-El(l) Cajon" in the summer time. Anectdotally, many houses in San Diego don't have air conditioning, but in Florida it's a pretty much a must. Wonder why?
Orlando weather might dip to 73F for about an hour at about 4 AM in the morning, but it's still often near or above 80 until about 11 or midnight. The Orlando local news that I watch does these hourly temperature graphs every night-- BTW.
Fans, open windows, ventilation-- all manner of evaporative cooling. In locked car or a sealed trunk, maybe not quite as much. During the daytime, probably not at all. A two year old child with very little mass would be even more vulnerable.
I'm not saying this isn't possible as a once and a while, as a go to the club for three or four hours kind of a thing. I'm just skeptical that it would be workable in the long run, it just seems improbable. And it seems that many of the "oh she's at Disney, or she's at Coco Beach with Zanny" were during daytime hours. I could be wrong, but wasn't this Zanny farce first mentioned in 2006?
Also, it also doesn't seem too feasible to bring her dead little corse inside during daytime hours, just so it won't smell quite so much. I'm just saying this seems a bit of a miracle-- not that it didn't happen.