In the book series 'Private', who thinks that Ivy Slade is actually....?

CAUTION: MAY CONTAIN SPOILERS

Who thinks that Ivy Slade is Ariana?! I just finished reading the book and it all seems to add up. Reed kept thinking she saw Ariana at the school, Noelle even thought she saw her once. And didn't Ariana have a thing for Gage? Ivy Slade was flirting with him! And why else would Ivy not invite Easton to the Legacy?? I personally think Ivy aka Ariana snuck into Easton during the Legacy after she found out that Easton had gotten themselves in. I think she was the one who burned down the original class building, not London and Vienna'a smoking. Also, at the end of the book it has an advertisement for a new series coming Fall 2008 called 'Privilege' saying 'What would happen if Ariana Osgood escaped....?'. So what is your take on it all?

In the book series 'Private', who thinks that Ivy Slade is actually....?
NO, i don't think Ariana is Ivy because I'm pretty sure Noelle would have know if it was her after all, they were bffs. And also, i dont think ariana was bffs with cheyene.And, it said in the book that Ivy was there when she was a soph. so it couldn't have been ariana. And Noelle and Gage bothe said that it was Ivy Slades adress not Ariana;s