Yup, this is 100% a production/executive decision.

"What? We gotta make her skin Orange? Ya know how much that's gonna cost!? Just Make 'eM Black, Thats exotic enough for an alien. Suckers will love it."

I remember when people said that Jared Leto's joker wouldn't have tattoos and that the ones from the intial photos just were part of a promotion or some stupid shit…
Nobody wears a pink curly wig and a purple hooker dress as normal clothes.
But the thing is that she says is a "misrepresentation" of the character, but she never said that is not how is gonna look, it sounds more of damage control than anything else, and no, I don't blame the actress, I don't know her and she is probably pretty good, I blame whoever thought this was a good idea.