I don't think she is campaigning against him at all but she definitely should be. He's an insurrectionist fascist wannabe dictator why would anyone want to vote for him in the first place?
I don't think the fans are flipping out at all. Mostly they are just laughing and pointing out how stupid it is. A good portion of them are children too. So children can understand how silly this whole thing is but these grown adults can't lol.