I dunno if she just picked a random year or not, but the Mayans predicted the world would end in 2012. They had the most disturbingly accurate calendar system of anyone in the world and it ends during that year.
On a sidenote, when I was in the loony bin many years ago, they wanted us to make 'goals' for every day. Retarded inane shit like "brush my teeth, write a story, take my meds, take a shit," stuff like that. Naturally I got tired of this quick. I recognized that it's illegal for them not to respect my religious beliefs, no matter what they are, so I put my superb bullshitting skills to work and managed to talk my way into them believing I was of the Mayan religion, and that it was against this religion to make goals. Of course none of them knew jack shit about mayans (admittedly neither did I at that point) and by law they had to respect my religious beliefs, no matter how ridiculous, so I would sit back with my arms crossed and a huge grin while everyone else made these fucking idiotic goal lists every morning.
I had this going for a good 4 or 5 days until they called my mom and asked her about it and she laughed and told them the truth.