4 year old diva?

I have a 4 year old cousin who lives in the house next to me.She shops at Hollister,Pacsun,Aeropostale,Abercrombie… & Fitch,And Limited Too.She goes around the house singing ''I got my drink and my 2 step'.Which is really not for her age.She is SO divalike.I'll ask her if she wants to watch Dora,And she says 'No,Forget dora,Put on some I love new york!"'.How can i stop her from being this way?