Lucky, The innocent and the guilty.

I am currently in the middle of reading the book, Lucky, by Cecily Von Ziegesar. This book is about the dramatic lives of the students that attend the high school, Waverly academy. A fire was set in a old building on campus, and now the principal is determined to find out who the culprit who started the fire is. The possible suspects are listed down, and now apart from their already complicated lives these teenagers have to play as innocent as possible, even the ones who are innocent. Tinsley, one of the people on the list of suspects is trying to get Jenny Humphrey blamed for the fire. Why? We don't know, but it seems suspicious. I think that Tinsley was the one who started the fire because she purposely act innocent around the principal and tries to blame other people for starting the fire.
Tinsley is acting suspicious whenever the matter is brought up about the fire in the old Waverly building. She went to the principals office and blamed Jenny Humphrey for starting the fire, even though Jenny was with someone else the night it burnt down. Although Tinsley usually gets what she wants, this time the principal didn't listen to her, which mad her tense. Why was she so nerve racked about it? If she was innocent there would be nothing to worry about. Tinsley's best friend, Callie, was suppose to go with her and talk to the principle with her about Jenny, but Callie canceled because she was with her boyfriend Easy. It mentioned in the beginning of the book that Jenny had liked Easy, was Callie jealous? I think that Callie was teaming up with Tinsley to get Jenny kicked out of school, because neither of them like her. Callie, most likely for the reason Jenny was involved with Easy earlier on, but why Tinsley? My theory is that Tinsley A., most likely started the fire, and B., does not like Jenny, whether or not she is trying to get herself out of the spotlight or not.