I really like it. To me, it is about the weight of expectations to do things right, indeed suppress your real self, being damaging.
I mean, the film shows what Elsa can do at the end when she is happy and using her powers positively. How many women don't get to use their unique talents positively because the weight of societal or parental or indeed later, spousal, expectations channels them a certain way?
I think the bit you mean, inboxer, where Elsa starts sashaying across the floor in full seductress mode is precisely because she is, at that point, untouchable. I agree that it totally plays on ideas of socially acceptable beauty and female desirability, but if she can conjure herself such an amazing palace, why should she not have the amazing dress to go with it? The cold doesn't bother her, anyway. I think the real message is that the totally free, ice princess life is not sustainable anyway, because it is not just her it effects. So, it is about finding a balance between being herself, but not doing that to the exclusion of all else (which would be narcisstic), and in the end, having a situation she can be herself in, whilst not shutting herself off from social relationships.
I am a single parent, I have no intention of having a man in my life but I do my hair and make up because it's fun to do different things and see what it looks like. I always got negative comments about wearing make-up when I was growing up (apparently my favoured shade of lipstick made me look like a prostitute
), and I never really ventured beyond a very neutral palette for twenty years. So, when my DD wants to buy and wear different shades, I encourage her to think about what suits her. She knows she doesn't have to wear anything but if she wants to, why not?
Besides, the film has taught DD that true love is not always what it seems and men can play on your vulnerabilities to get what they want (Prince Hans). The line where he says 'but you were so desperate for love, you would believe anything' really hit home. That is what happens if you grow up emotionally neglected. Either that, or you shut yourself in an ice palace (metaphorically speaking).