The film is absolutely awful.
Historically it is EXTREMELY inaccurate, and it reads more like the stupid fantasy of a teenage girl obsessed with fashion who wants to be a princess, than anything else. The overextended Vogue photo shoot-lite scenes showing shoes, dresses and cakes are utterly pointless, and don't reflect anything other than Sofia Coppola's own immaturity, imbecility and lack of talent. It not surprising that she frivolously made a silly film about a vapid, boring and superficial cheerleader type playing Queen-for-a-Day dress up. After all, the only subjects that she seems to be able to struggle to discuss at an adult level are clothes, fame, antiques and how it all relates to her (read any of her interviews or watch her make extreme efforts to string a coherent sentence, and you will see what I mean). This film was her own fantasy, and that's about it. There is nothing else to it, and it doesn't have any substance at all.
So yes, her films look very pretty (her cinematographer and stage designers are EXCELLENT), but never have anything to say, other than presenting the empty-headed musings of privileged idiots with oversized egos.
As for MA, her life was a lot more complex than what the film reflects. Yes, she was not intelligent and hated life in France, but she did a lot more than walk around wearing pretty dresses and jewellery, eating cakes and lying down in the grass at the Hameau de la Reine. She played a key role in the American Revolution by ensuring that Russia and Austria would support the French and American colonists against the British, and as a radical reactionary, adopted positions and supported people that she shouldn't have, but she was far from an 18th Century Bratz doll, which is what that Coppola idiot came up with.
In short, the film could have been quite interesting if:
A) It had shown how life REALLY was at Versailles (insalubrious and oppressive). B) It had placed everything in the political context and shown how Louis XVI and MA were part of if, as opposed to a bumbling cretin and a shopping-obsessed strumpet. C) Greater emphasis had been placed on what was happening outside of Versailles, and why the royal family and MA in particular, were so unpopular.
If the collection of stupidities I've already mentioned were the only things that Sofia Coppola got out of Antonia Fraser's book, I am shocked that she is not a vegetable.