Today's Isabel-ism

Isabel, while coloring, "hey Mom, is this Nico?" 
Mommy: "is what Nico?" 
Isabel: "you know, Nico! in the rainbow!!" 
Mommy: "you mean 'indigo'?"
Isabel: "wait!  Nico is ingo?  how do you say it?"
Mommy: "In-di-go"