Even though we don't grow wings, we humans can still fly. This is a good time to let your daughter discover the history of human flying. From simple aircraft to sophisticated space travel to the Moon, Mars. Even hot air balloon, mountain gliding, or even bungee jumping are some forms of flying.
Get her books on the subject. Get her a remote controlled toy airplane. Turn her curiosity and imagination into a learning opportunity. You never know, she may one day become a great space scientist.
Well,it is time to teach you dont always get you want, yet you try.
Or you can tell a lie, saying that she cannot have her wings until the transplant is available, after all, her wish must rely on a generous angel who is willing to give off the wings in order for her to fly. But as angels are so busy flying around accomplishing God's command, there are no spare wings available for her. So, she must wait until that happen.