Yes of course 7 yr old girls can be slack 
I didn't notice the music as such, just that it was busy and kartel, I don't see the problem, have you ever been to Jamaica? You'll hear that on the bus!
And no I really don't see a 7yr old being sexual, she could wine more dance more even sing the lyrics and get on a pole but I wouldn't see her as being sexual she's just dancing the way she saw others dancing.