Board Thread:Naruto Discussions/@comment-945885-20140709082448/@comment-24855268-20140711215810

Spyrocks wrote: One thing for sure about this chapter, Kaguya seems more like a dependent child then like an adult villain of Naruto.

My theory is that as she ate the fruit from the Shinju the will of the Shinju slowly took her over. This would explain both her child like mentality and the difference between her starting out peace loving then turning into a tyrant. It's also an ongoing theme in Naruto that all bad guys aren't really bad but good people corrupted in some way.