The vast majority of Crossfitters are not at a level of physical fitness and mental toughness that would put them at risk of rhabdo after a WOD. They'd throw in the towel long before "meeting Uncle Rhabdo" under most normal circumstances.

However, certain external factors can affect the risk - high humidity, heat, improper hydration, and poor nutrition can significantly increase the chance of catching rhabdo from a workout. It sounds like the subject of this post got caught up in the competitiveness of the workout, turned a deaf ear to what her body was telling her that day, and paid the price for it. It's a mistake that many inexperienced athletes make when thrust into a competitive setting, and most of the time only ends with "meeting Pukey" or some really bad DOMS the next morning, but the specifics of this circumstance (pushup-overhead couplet sounds like a stupidly dangerous WOD, plus a "warm Texas evening") lead to a significantly worse outcome.