One thing I don't get
At the end of the "Knock on Wood" scene Olive tells the principal that he needs to talk to Mrs. Griffith since she will be able to convince him not to kick Olive out of school. But, why would Mrs. Griffith help Olive or in any other way be helpful in her not getting into trouble with the principle?
It would only make sense if Mrs. Griffith would convince the principle not to kick Olive out of school if Olive would still keep the secret of Mrs. Griffith's affair (and therefore make sure the secret doesn't come out). But, Olive told absolutely everyone about it on the webcast. Why would Mrs. Griffith care about Olive's well-being anymore? Guilty conscience (if she even has such, since Olive calls her pure evil)?
Olive has nothing on her part that can make her so sure that Mrs. Griffith will help her in staying at school. Furthermore, all the things Olive did (not applying to school dress code, doing a dance/song in front of the whole school, which is very sexually suggestive, insulting the Principle/not acknowledging his authority, etc.) were made by her on her own, and Mrs. Griffith doesn't even know about them and none of this was triggered by or is in relation to Mrs. Griffith and her secret. So, Mrs. Griffith cannot undo the things Olive could get suspended for in the end.
So, yeah, in what ways can Mrs. Griffith be helpful to not get Olive kicked out of school?