this weekend marks 25 years since the columbine shooting that left 13 people dead. since then it's a tragedy we've seen repeated far too many times. tonight, our kate snow visits with a survivor from that day who now has a daughter the same age she was then. >> yeah, so pretty. >> reporter: preparing a daughter for senior prom is a big moment for any mother. >> love it. >> reporter: but for colorado mom amy over, it's especially emotional. 25 years ago this week, amy went to her own senior prom at columbine high school just three days before the mass shooting. >> 25 years later, you now have a daughter who is a senior in high school. >> i do. i can't wait for her future. and i think that's why i get so choked up when i talk about her and my kids, because the last time i was normal, not normal, but amy normal was prom.