I Don't Eat The Crust

Kambri refuses to eat crust...not just crust on bread but the crust on everything! We were traveling to Las Vegas last week and she was eating a croissant and hands me the outer edge and says, "I'm all done...I don't eat the crust" Then this Saturday morning I made cinnamon rolls for breakfast, Kambri licked all the frosting off and said, "I'm all done....I don't eat the crust". Where is the crust on a croissant or a cinnamon roll?