You are able to tell that she doesn't 'really means it'? How?
Because most people who sincerely want to avoid violence, don't agitate and commit acts of violence.
Here's how it works. People who sincerely believe a position have a right to express that position without being physically attacked. To portray putting a sign in the window of a passing car as an act of 'violence' is absurd. If she were a legitimate threat, then only the actions of the first person that pulled her away would be acceptable. Profitt's actions were NOT.
Profitt's act was not acceptable, nor were hers. People do have a right to express their opinion in a nonviolent way. That's how it works. Shoving a sign through the window into the face of Paul was an act of violence. Just not to some left wing nut like yourself.