80 is the new 95.
It's still warm no matter how you cut it. >_>
Or you've just never lived somewhere with high heat and they do, lol. Neither side is wrong when considering all that she was wearing. You're not wrong, it is hot when put together. They're not wrong, 80 and breezy feels great and is far from intense heat.
It's hot even when you don't put together her outfit. Given the added conditions of her outfit and how long she was out there, I'd immediately assume heat exhaustion over anything else.