As your granddaughter learns Portuguese, one day she will sing "Manhã de Carnaval" for you in its original language.
This world-renowned song was the theme music in the 1959 film Orfeu Negro (Black Orpheus), and lyrics have been written for it in many different languages, but most do not keep the original meaning of the song.
I happened to find a rendition of it in Portuguese, along with an English lyrics that keeps close to the original (the singer switches to his English translation near the end).
YouTube - Manhã de Carnaval with Updated English Lyrics