I know where this claim as this being Rachel Scott comes from, on one of those Columbine websites, this guy talked about donating money to a group and they sent him photos, the infamous suicide pictures being amongst them.
What strikes me from that website is one of those who responded talking about going to columbine after the massacre and mentioning a girl defecating herself out of fear in the library.
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FUCK IT ALL, FUCK THE WORLD, FUCK EVERYTHING YOU STAND FOR!