The description you give is not suggestive at all of diabetes, the first episode of low sugar with intussception is expected, during sepsis (high white count) and illness in a small 2 yo child who has not eaten it is not unexpected to find a low sugar, the insulin is normal, NOT too low, this insulin level in the face of a sugar of 85 is appropriate and rules out hyperinsulinemia(a cause of low sugar) and makes us feel better in regards to the low sugar that occured earlier.