Sounds like she REALLY pays attention.
"Chew your food well or you'll choke."
"Don't give that to the dog, he could die."
"Careful, that could burn you."
"Careful, that could catch on fire."
"In case of a fire, stop, drop, and roll."
In a single day we're typically warning toddlers about death a gazillion times. Fall and break your neck, take that out of your mouth, don't let your brother, look both ways and hold hands... even if we're not specifically saying run over by a car, posioned, squashed by a fall... many smart kids just extrapolate the natural consequences from those daily-we-don't-even-think-about-them-cautions-and-warnings. Then (since kids are natural scientists) they start wondering what ELSE has the same properties.
My son was reading by 3, so we had the added accidental-suicide-watch of "warning labels = instructions" to a toddler mind. So on the one hand, he was actively courting death, and on the other hand he was just totally impressed/ scared at the number of ways he or someone he cared about could off themselves. They were trying (and precious) years.