actually, when her toy-description first appeared that was the general theory. that she was involved in what happens in Equestria Girls.
it was fairly obvious
though honestly i was hoping she'd be a new fun Friendship is Magic character, not an Equestria Girls antagonist
i wouldn't mind if she was brought over from Equestria Girls into Friendship is Magic (which i'm a bit worried that they might bring EqG stuff into FiM, the supposed love interest is my biggest fear), though she would just be another post-antagonist character at this point