Though the comics go with the interpretation that she was kicked out.
Trolling Creator: Of a sort. Ever since "The Crystal Empire Part 2", the fans have been speculating on the book Luna pulled out. The commercials didn't help things, as they claimed Twilight would meet her destiny. Cue Applejack telling Pinkie Pie that Twilight had new spells to learn, which incited quite a bit of interest in the bronies. Except that we never get to see what Twilight's working on because Pinkie Pie chooses to sit by the mailbox all day.