It could be a memory thing. I am trying to remember the phrase but I discovered it while helping my FDH with a psychology class. It's similiar to when your mother tells a story about when you were really little to say a friend or neighbor and you absorb the words and turn them into a memory that even though it's not YOUR actual memory, that account is now real to you.

From Wikipedia:
"Generally speaking, misattribution of memory involves source details retained in memory but erroneously attributing a recollection or idea to the wrong source.[1] Misattribution is likely to occur when individuals are unable to monitor and control the influence of their attitudes, toward their judgments, at the time of retrieval"

That's a scientific gobbledeegook reason for why but it's worth a look: Misattribution.

It could be too that she is absorbing the adults' viewpoints because she wants to do or say whatever is pleasing to them. You know how some people talk politics and then suddenly someone who has zero prior knowledge or interest starts buying into the party line of whatever anything else in the group believes. That's how we learn racism or religious beliefs or political ideals, all that stuff. We learn by the people around us. Her making them her own may mean she is trying to fit in and be accepted so she is convincing herself that she feels or thinks that way too. If she is 9, she is what, 3rd grade? That's pretty normal for third grade. My biokids' teachers have told me that kids naturally start forming cliques and groups in third grade. I was shocked it was so early but they seed themselves apparently. I was expecting junior high.

Good luck - hope my random "man I am bored at work" ramblings help