Deciding that angering a witch is a bad move, you take a deep breath and, as politely as possible, make your request again. "I would appreciate it very much if you would return me to adult age."
She waves a hand and marches off, and you feel your body tingle again. Within moments you see that you've returned to your regular age. You do a quick check to make sure she hasn't left any surprises, but your clothes changed back normally and everything about you seems normal.
Then you take a look at the playground, and realize how appealing the idea of being a kid again has suddenly become.