If she was mowing with headphones on, she would likely be completely unaware of her surroundings.
I was thinking that - earbuds, etc.
Hot day, maybe really tired too from the heat.
The other day, busy 4-lane road, basically a highway inside the city just off the main highway - guy riding a RAZOR SCOOTER in the middle turn lane - very difficult to see.
Oh, and he was doing it in ......... RUSH HOUR TRAFFIC...........
What do you think she’d otherwise have done, jumped off the mower far enough to avoid the crash?
Presumably a good swerve of her vehicle wouldn’t have spared here.
Looks like this boat skipper also wasn’t paying sufficient attention:
https://www.yahoo.com/news/entertainment/man-killed-whale-strikes-boat-205244601.html
Your riding lawn mower must be quieter than mine. I can't hear someone yelling 20 feet away. I use hearing protection to keep from going deaf.