Kathy Griffen's "prostitute" comments?

This supposed comedian calls the daughters of Sen. Scott Brown prostitutes. I fail to see how committing libel is a great career move. I don't really know Sen. Brown or his daughters, and I really don't care about his political views one way or the other. But, I am thinking that this Griffen women must have suffered a mental breakdown to say behave so childish. Your thoughts?