Preteen Conflict!( READ MORE )?

I have a 6 year old little cousin.She tells everyone shes a 'preteen'.Its annoyingg! She listens to Fergie,The beatles,RAPPERS.when she should be listening to hannah montana,selena gomez,and such.She wants a cellphone and I talk with her but she takes everything seriously.She thinks she too old for dollies but shes in kindergarden! Her parents dont know,but she has a facebook.She does A 'snookie' puff' and she calls herself 'almost a teen.PLEASE help and give me advice and what age is preteen considered and how i should talk to her parents! And she cant rap a single verse,but she acts cool by listeniing to eminem!