Freedom of speech is one thing, but this is a threat. Others get arrested for evening mentioning the word 'bomb' in an airport, on a plane, and many other venues. Yelling fire in a crowded theater causing a stampede just because someone thinks it's funny is a crime. Free speech has nothing to do with these kinds of acts. People get arrested for their FB posts threatening harm to others or encouraging others to do harm.

I don't care who she is, what she is, that is just wrong. Some nut job will end up doing something like that because of this kind of rhetoric. She needs to be arrested just like you or I would be, and rightly so, if we did it. Even if she said it in jest, it is far from funny.