She was arrested for disorderly conduct (i.e. yelling and making a scene). It appears she did interefere with the screening process (a civil violation) as well, but that's not what she was arrested for. With respect to Sec. 46503, you can argue that her conduct falls within its scope, but that's not what she was arrested for.
That is correct. And there is NO doubt that she will be fined. The question is, fined how much? Knowing she planned what she did, if regulatory found out, do you think they may give her a larger fine? Its very, very possible. And then regulatory can forward it to TSA CI, and they could decide to press charges.
Now, I don't believe THAT will happen - but its a possibility. Which is why it was stupid of her to post her possible criminal activity online; and why it was not good to post this link on a site where TSA employees come visit. Again, just saying.