Please see Brandenburg v. Ohio. The speech must intend to produce imminent lawless behavior. If someone is leading a group of thugs with torches down a suburban street and says, "Let's burn it down!" there might be imminent lawless behavior, but the fact that no one immediately acted upon her speech means the temporal condition has failed.
I understand your point. It is valid and well thought out..yet...I still believe they could arrest her..and should.But what do I know? It is just a reaction I think many would agree with. It does not mean I am right and you are wrong. It means you are thinking and I am pissed off. (My mama would not approve of my language...a lady does Not..(she would have said.)