I really don’t know much about Kelly Loeffler but I wouldn’t insult anyone by calling them a Mitt Romney or a Jeff Flake until I knew for sure. In the political realm that about as insulting as it gets.
That a reaction to her campaign donation in 2012 to Romney but none to Trump in 2016
A whole lot of GOPers had reservations about Trump in 2016.
I think she made the wrong choice but I really cannot hold her to it without also jettisoning about 1/3 of Trumps current GOP base for the same reason.
So I will wait and see what she does with her chance. Trump turned out to be a fantastic President despite the concerns many, including a lot round this website, had about some of his earlier positions.
In any case, it is to late to do anything until Nov 2020 now.