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You are focusing too much on aesthetics. It isn't all about physical characteristics. What about Johnson's performance made her bad for the part, in your opinion. At no point did I find her performance to be unbelievable for the character she played. The personality she depicted fits the character well. Just her mannerisms and face showed a person who at first glance appears to be country bumpkin, but who is secretly extremely wise and has some hidden knowledge.

Even not knowing her background I could tell that something is fishy about this character. And this is revealed just through her performance from the first scene. This mysterious characteristic instills curiosity within the viewer. The curiosity is finally rewarded at the end of film.

The balance between country bumpkin and mysterious enigma, is not that easy to pull off in a performance.