Like "Yeah, it's kind of like trying to have the "sex" talk. The light bulb will go on later in life when she remembers things you did or said. Kids who are 4 who are diabetic themselves can grasp it, so it's not over them. It's just a different view from that age. She doesn't have to understand, she just has to know that grandma loves her and talks with her. You will have all kinds of opportunities to share with her in word and action."