I'm pretty sure "Let It Go" WAS supposed to be the "evil Elsa song". But when the producers heard it, they considered it more of a song about female empowerment and changed the plot accordingly.



You may be thinking of "Life's Too Short", which was cut at the last minute during pre-production. They actually had it fully storyboarded out with final character designs when it hit the editing room floor.



Elsa became progressively less villainous from what I understand. The version you have here was when she was pretty much still a straight villain, I believe, but even when she got her final design that made it into the movie she was still more of a straight villain. (Note that infamous promo test reel they did where Anna says "That's no blizzard, that's my sister!" featured Elsa as the villain.) By the time they got to "Life's Too Short", I think she was still the villain but one who was going to "turn out alright", who was a mix between the Snow Queen and Ky's character from the source material who needed her own "heart of ice melted".



While I would indeed like to read the original script or even see a "Frozen: The Original Cut", I think what they ended up doing was a better move. If they had gone with the next-to-last version, Elsa would have been portrayed as a character who was unhappy because society always told her to restrain her powers and hide herself, decided to get revenge by making herself a queen by force and freezing everyone whether they liked it or not and basically develop sociopathic tendencies, and in the end would have been persuaded by Anna to give it up. The idea would have been conveyed that "women should know their place and be good little girls like Anna was; because if you give them power they'll just use it to become corrupt and hold it over the heads of men like Elsa did, who learned it's better to be nice and proper and conform to male-dominated society then to act out", even if that wouldn't have been the intention. There's no question that people have read a lot into the first Disney Princess movie that really balked the trend that other movies set, and they would have read too much into the other version too.