When you fall and bite your lip, and mommy and gives you nothing more than a second glance, who better to go to for sympathy than your big sister?
And when the big sister is wearing a ballerina costume to begin with, it's only logical that in such an emergency you'd just throw on the doctor hat and get your medical equipment.
And you'd find a nice, cozy spot on the big chair for you patient to lay, while you check her blood pressure, take her temp, give her shot and cover it with a band-aid.
And then when Daddy gets home, it's always best to show him the injury, looking as cute as possible. It's good for that sympathy factor.
And then for good measure and a possible extra-dose of sympathy, you might as well go for the dramatic reenactment.
"See? Addie... did... that." (Addie takes a breath or pause between words.)
And then, of course, Mommy will blog about it.