Wow, I think your sister might be smarter than most Dems if she figured him out this soon. I have a feeling most of his followers are remaining true believers.
The ones who are not "true believers" but voted for him because of white guilt and because they actually believed his BS, will not change their minds quickly for the most part, because if they admit he is a liar, a socialist, communist SOB, then they will have to admit they made a mistake. People hate admitting they are wrong.
What we will see is a gradual building up of rage and soon most people won't admit voting for him, that way they can get out of admitting they screwed up!