"That being said, however, this is not the lead role for her. She is PHYSICALLY and VOCALLY completely wrong for this role. Those are not things that can be changed by "good acting." She has been cast only because she, her friend Platt, and her management company are putting up the money. "
What a negative way to see things

. She has connections, for sure, and she'd be the blondest actress not to use them... but maybe she really did think the part was interesting and loved Dusty and started the idea of a Dusty biopic. i'm not saying that's what happened, there's just reasonable doubt, your honor
You assume that a producer in a movie is the guy putting up the big bucks but it's usually the studio that finance a movie. Producers work for the studios or have independant development deals but that doesn't mean putting money into it, that most often means getting money out of it, but that's beside the point
and as I said, Dusty cannot be cloned... physically or vocally. Maybe it's a good thing that they are not trying to get an impersonator... I guess only the movie will tell.
"What book of rules says that theatre exists only within some ugly buildings crowded into one square-mile of New York City? Wherever there's magic and make-believe and an audience, there's theatre..."