Is my cousin overreacting?

My cousin has an elementary school age daughter. To the best of my knowledge, she hasn't spent a day in a school. She still gets educated; my cousin no longer works to keep her daughter up to date in education. The reason her daughter doesn't go to a school is because my cousin is afraid of school shootings. Granted, they rarely happen in elementary school, but it's still a possibility. Is my cousin being unreasonable and overreacting to the fear of a school shooting taking place at her daughter's school?

P. S. This isn't in a reaction to the recent shooting in the GA school. My cousin made this decision after the Parkland shooting. However, I chose to ask this question while people can actually remember that school shootings still happen.

Is my cousin overreacting?
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