She DID know. The school administrators reviewed her speech well before the commencement and told her that her comments were inappropriate and had to be changed. Instead she chose to lie to the adminstrators and continue on with a speech she had already been told she couldn't give. In another thread on this topic I said she should have raised a stink about it before the commencement, but she chose not to, likely because, as sinkspur said, she wouldn't have gotten any attention for doing that.
"She DID know. The school administrators reviewed her speech well before the commencement and told her that her comments were inappropriate and had to be changed."
That being the case, she should have edited her speech for review and then given her original speech. Officials would have been ill-prepared to turn off her mike.