I agree with her right to display that sticker. If she wants to show to the rest of the world how low rent she is and want a poor loser she is who is severely lacking decorum, have at it.
Now if this had happened between 2009 and 2016 and the only difference on the sticker was the name Trump was replaced with obama, you could not fathom the weeping, gnashing of teeth, and rending of garments that would have taken place at the DUmp.