Doubt it, but not out of the realm of an idea.
To be honest, I don't think she does have a human self in that world. CHS is meant to be Canterlot or Ponyvile, and Crystal Prep is the Empire. Yet in the human world, Twilight is at Prep. The movie made reference to the first ep with her knocking Spike back with the door, which was done in Canterlot in Pony. Sunset, as far as we know, came from Canterlot and left her studies. Which means... if your idea is to work, means Human Sunset would have to be a drop out of Crystal Prep and in the city still. I'm just shooting things out, but it is a bit far fetched for a movie, A comic maybe... but thats as far as I think that train will go.
As for me, how do I know so much? I'm good at deduction and I have a little sister... nuff said.