Griffin probably probably intended to apologize all along. This entire incident was all about her, not Trump. Just a desperate plea for attention, "Look at me! Look at Me! Look at MEEEEEEEEEE! I want to sort of stay semi-famous!!!"
But that's not the point. I think most people will agree that what she did was technically legal, but in bad taste and not even remotely funny. Just like her entire career. She's going to get a visit from the Secret Service as a matter of policy and they'll close the case and move on. But that doesn't address the bigger question. Is a high school student doing the same thing about his principal going to be viewed the same way? Can a pissed off homeowner hang up severed effigy heads of neighbors that are pissing him off? The laws are the same, those people have the same first amendment protections that Griffin does, but I get the feeling that the public outcry and official law enforcement reaction would be very different.