That doesn’t fit very well, or perhaps she’s wearing the wrong bra, but objectively speaking it’s a beautiful dress and it makes her look good.
Let’s be fair: if she were known to be a sweet Christian person or if she were a conservative, we would be far less critical about her choice of evening wear. I hope we would still be critical about her posture, manners, choice of daywear, and general bearing, which are all dreadful.