I really hope she is happy.
It breaks my heart to see her personality issues... I honestly don't get how her personality changes so much from time to time. But the current one is the one that troubles me... suddenly she indeed starting acting like a child. My guess is that, as she is so dedicated to her boys and niece, she gets that childish behaviour from when her role with them.
But that would not explain the faces she makes on stage, how she acts in some interviews, etc. I think there is something we don't really know and sadly we'll only hear when she dies and then they release "The real story of Britney" to keep milking her name.
I love her and the fact that she continues powering through it is what makes me be here <3