Penelope,
You were great at the doctors office today. Probably better than I was at your age.
The night before we told you “tomorrow we’re going to the doctor. Mommy, daddy, and Penelope. When we get to the doctor’s all of us are getting shots.” I acted out the action, depressing the non-existent syringe We told you in advance because neither of us would feel right if we said “it won’t hurt”, knowing it would.