It seems she clearly ignored the policies on sending out mass emails to the faculty. She even stated that she would not discontinue her actions.

She is clearly fighting a political fight of protest where her entire intent is to get as many eyeballs on her grievance as possible.

It isn't so much as an issue of free speech. She isn't being censored for her opinions. She is being reprimanded for a breach of use in computer systems. What she has done quite successfully is gotten a much larger audience on the original issue than would care otherwise.

As far as I know it is illegal to drive with a cell phone to your ear. I do not think it is illegal to look at the screen. This is one of those poorly written laws that covers one particularly bad behavoir but leaves the door open for related ones even more dangerous, such as texting.