Someone took a closer look at that very tiny bit of script Tara Strong released some time ago. They discovered that if you look really closely at the bottom left corner, you can see the word "Cadence". It is probably a page of the script directly below the page that the leaked line was on.
Huh, that would be interesting if she returned in season three.
For those of you cannot see it, here is a slightly clearer version:
Spoiler