Do you know this song?

"♪♫ I'm taller than you, and I'm going to invite you to my birthday party ♪♫" ?

   Yeah, I don't either.  Natalia started singing this 'song' and then asked me if I knew it and whether or not it was pretty.  Of course it is! 

  Everyday, it's another song, made up out of whatever she is thinking about at that moment and strung together in a musical (?) medley.  And she always asks if I know it.  I wonder....  Does she think I know everything, so I must know the song even though she just made it up?  Does she think that it is a universal theme so someone else must have already sung about it?  Does she just not know the difference between songs that have been written down and songs that are made up spur of the moment?  Seriously, I wonder how her mind works - what is going on in there?