Hours after she escaped the Columbine High School shooting, 14-year-old Missy Mendo slept between her parents in bed, still wearing the shoes she had on when she fled her math class. She wanted to be ready to run.

Twenty-five years later, and with Mendo now a mother herself, the trauma from that horrific day remains close on her heels.

It caught up to her when 60 people were shot dead in 2017 at a country music festival in Las Vegas, a city she had visited a lot while working in the casino industry. Then again in 2022, when 19 students and two teachers were shot and killed in Uvalde, Texas.