She doesn't travel for work - she is a classroom teacher. When we go on vacation no one keeps track.I get it but I don't. Does she struggle with travel when you switch time zones? Like jet lag? 1 hour is very minor for that. Sure, when I went to Oz I was a mess for a week like a really bad/long hangover.
Like I said, its not a few. Heart attacks/ strokes / car accidents. All spikes on spring ahead. doctors have correlated with disrupting the circadian rhythm - your sleep cycles. Ask an elementary teacher how it goes right after the spring change.
Only a small percentage of people travel regularly. I suspect that people that don't do well with this don't take travelling jobs.
It makes no sense to me to change back and forth. If you don't like whatever work out changing your schedule with your boss or change jobs. The whole thing was contrived during WW1 and it is just monumentally stupid to change clocks for no apparent reason.