I can confirm that there was little reaction when the duke accused her of being a monster, and a sorceror. But its probably because sorcery isn't vilified in that universe, and that everyone understood that the duke was just trying to loudly justify having his men join the chase so they could assassinate her.
Let's review this.
Everyone knew the Duke was going to try and assassinate the queen.
They don't react....Something's up with this.
She freezes the royal palace at the end of the movie for her subjects and the guests of the coronation and everyone loves it. It's clearly not even a big deal.
Anyone can enjoy magic when it's being used for them. And when they don't have a choice. And when you are selecting from the population most likely to be biased towards the magician (the Arendell royal family seems to have a pretty good relationship with its people).
I'm not saying prejudice against magic is universal, I'm saying it's not uncommon.
Its implied that he has several older brothers (the whole "three of them pretended I was invisible.. for two years!" thing happens to younger siblings)
Also, he tells Anna that he has twelve older brothers. There's no reason to think he would lie about something like that.
Honestly you don't need to justify anything in this game in relation to the movie GWG. Just write it off as an alternate history based upon the events seen in Frozen and be done with it.
Why?
How we as players see Elsa(debatable): ]https://www.youtube.com/watch?v=L0MK7qz13bU]
How the prince sees Elsa(Watch the whole thing. They add more then you expect): ]https://www.youtube.com/watch?v=5GRUPNXbflQ]
More or less. Most people don't know what happened the way we do; they know, at most, that the queen is a sorceress who threw out foreign emissaries/nobles and spread horrible rumors about them*, threw aside long-standing trade relations for minor slights**, and
froze the whole world.
*And don't say they kept quiet. A nameless character clearly states that he intends to tell the Southern Isles' royal family about Hans's "behavior," which can't exactly mean much except how he tried to let Anna die to advance his position and whatnot. Which there is no evidence save Anna's testimony for. (And the only evidence that might have existed--the doused, and hence wet, fireplace--was destroyed by Olaf. Nice going, snowbrain.)
**Yes, the Duke tried to have Elsa killed rather than captured. One, this probably wasn't an uncommon thought--not ideal, but it would have stopped things from getting worse, while capturing her could and did make things worse (though they got better). Two, there is no way for anyone except the Duke and the two soldiers he ordered to know that the Duke ordered them to kill Elsa. Three, there is no way for anyone outside the party to know that they didn't have kill-on-sight orders. Four,
two and three apply to Elsa as well! Five...well, Weselton is Arendell's closest trading partner, and Elsa decides to punish whatever slight by
completely cutting off trade with Weselton indefinitely?!? That's...a bit short-sighted. It certainly won't give anyone any confidence in Elsa's ability to do diplomacy. Or monarchy.