I watched it this morning.
Having grown up in Paris, from an immigrant background, I was interested to see how it is portrayed. For me, you are given too little understanding of the girl's traumas, feelings and motivations, to see why she changes her behaviours so abruptly.
I understand the motivation for showing the dance scenes, but they seem overly long and there is much that could be suggested rather than overtly shown.
I also couldn't understand whether they were supposed to have just come from Senegal or if they were living in Paris for a while already?
I dunno, I found the whole thing strange and without the ring of truth. It's true that I really don't know much about the Senegalese community, so that aspect may be accurate. But certain other aspects... just seemed badly-portrayed and unrealistic. There seems little distinction in the film between the assimilation and attitudes of different immigrant groups and, considering that French schools are super strict, much more so than here, it is impossible that the school wouldn't have implemented some home intervention when the girl Amy started behaving so out of character.