She goes on to link this Snapchat video as a part in a string of events that she sees herself as an unwilling participant in, dating all the way back to the Beyonce "Single Ladies" incident at the VMA's. "Being falsely painted as a liar when I was never given the full story or played any part of the song is character assassination," she writes. "I would very much like to be excluded from this narrative, one that I have never asked to be a part of, since 2009."
But here's where things get really complicated! As others have said, it's clear Swift made the screenshot after searching through her notes. Also, as New York Magazine points out, if you zoom in near the search section, you can see the outlines of the words "because it doesn’t exist,” which could be the title of a draft of a similar note she had saved on her phone, suggesting there were a few different contingency plans already in place for how this controversy could play out.