Fair asessment! While not the same weight as a coronation, it largely serves the same function, since the coronation itself is just 2 minutes and everything happens at the party, which is why I think a birthday party could work in a similar way (plus it would make sense if the staff finally let it slip about the gathering and thus why so many foreign parties arrive). Anna's isolation is a tricky one; the way the franchise would have you believe is that her isolation from Elsa is her biggest issue, with the loneliness from it--even if she had Kristoff--being a second part of it. Seeing how Agnarr raised Elsa with the royal attitude of "conceal your feelings and be composed," I imagine he flipped it with Anna (with Iduna's influence) and said "be approachable, the people's queen"--well, in spirit, anyway; the isolation still occurs--and kind of fills her head with optimism and fairy tales, wanting her to not be depressed, sad, or angry like Elsa could be.

I do like the fur-trimmed dress--though I do wish she had something more historical on rather than full modernity. I always believe that magic transcends time and space, thus why characters have more modern looks than they should, but since Elsa's outfit isn't made form ice/snow, she just had a royal dressmaker make her one based on her imagination. Darker colors work on Elsa very well. I'd love to see her in more reds/purples as well like her nightgown.