Usually ugliness from within manifests itself in physical ugliness. And in the case of Mizz Drabble, this certainly holds true (imo).
Would you judge all ugly people to be ugly inside then?
Ugliness within is hardly EVER manifested on the outside, in my opinion. Why? Because people with true internal ugliness are sociopathic, without conscience, and they don't worry.
Physical beauty is absolutely NO indicator of goodness at all. None. Ted Bundy was a great looking guy--but a deadly socipathic killer. Most serial killers, most genocidal maniacs, most tyrants are good-looking people. Why shouldn't they be? They don't worry about anything. IMHO Equating ugliness with evil is a big mistake. Evil is a master of disguise.