@MandyJane @Gnomeshatecheese Take heart. Most grow out of it.
She's probably like that because she's still young and hasn't met any serious resistance. I was lucky, because my parents, but especially my dad, made me justify everything I thought and made me explore it with some intellectual rigour. It was never personal, it was about the idea not the ownership, so my ideas were not my identity. It made me question everything.
For example, as a young teen I read in the local paper about a man who had been fined for taking in hundreds of stray dogs. My first (emotional) thought was that this was unjust and how could anyone think that taking in strays was a crime. He made me read the article more thoroughly, think about what living next door might be like, what problems taking in so many dogs might entail, as well as considering press bias etc.
Being able to put things into context and consider the whole, without being dragged into an easy emotional response is often very helpful, but not always easy in our tribal times. It's not to say that emotions and instincts aren't helpful (they are) but they're not the whole picture.