What Mr.Mattero Did by Priscilla Cunnings

I just started reading a book called What Mr. Mattero Did by Priscilla Cunnings. So far the book is good. It is about about three seventh grade girls who are best friends, accusing their music teacher, Mr. Mattero, of Sexual abuse. The three girls, Jenna, Claire, and Suzanne, appearently say that Mr. Mattero has touched them in an inappropiate manner. In the book it seems as if Claire and Suzanne didn't want to go through with this report, but Jenna insisted on it. So they go to Mrs. Fernandez, the principal, and reports the so called sexual abuse. When she sees that all their stories match, she calls their parents. After the parents come, Mrs. Fernandez calls Mr.Mattero down to the office, surprised he goes. That's when is punched in the face by Jenna raging dad. That's when detectives come to the school and Mr.Mattero is suspended with pay. Claire never planned for this to happen, but did Jenna know this would happen all along?