Thing is, they could have told this story with the same clips, but remove all the close up shots of the kids' asses and crotches and all this disturbing shit. The entire point is to show young girls trying to emulate trash/whore media at a young age. You can do that in a lot of ways without making it sexual. The elements are already there - stealing money from her mother, stealing a phone to use messenger, watching twerk videos, acting bitchy, not helping mother up when she collapses, becoming more violent etc. Those elements are there. They could even dress them in some of the clothes they wore near the end. What really isn't needed is the twerk dancing and more raunchy aspects of the film. They are 11.
Hell, you could probably do the exact same film and up the age to 15 and it would be received slightly better - that's the age teenagers start to try to wear all this garbage anyways, how many of us knew girls at that age who would bullshit and try to act 18/get drinks at 15-16, or dress more revealingly? But 11? Fuck off.