Why isnt Big Bird in the alphabet?

Emilee and I were driving in the car coming home from school and she was in the back singing the Alphabet song over and over again

Emilee: Mommy why isn't Big Bird in the alphabet?

Very confused and trying very hard to figure out what she meant

Me: Big Bird sings the alphabet on TV is that what you mean?

Emilee: No, Elmo is in the alphabet but not Big Bird!!!!!!

Me: Do you mean in a book or on TV?

Emilee: ( A very Big) No

Emilee: The song goes H I J K ELMO P