She probally doesn't remember because the Victorious cast would go out and get plastered. And they don't remember shooting many episodes because of that.
Is she talking about "Imagine" from "American Girls Revue"? Because, if so, dang! That was such a long time ago in the history of AG. What nostalgia! Sorry, just that bit she sang made me think of this song. Lol! But I can "take a hint" and end my comment here.