would this make a good story?

I'm writing a story called Demmionese. It's about a small girl who has a made-up lanuage that she speeks all the time. she gets made fun of for it. then aliens threaten to destroy the earth, and they can't undertsand the humans, so the humans can't reason with them, but the aliens can understand the little girl. She has to go to the alien's home planet and reason with the leader, then go back to earth to get the other humans to believe that she can understand them.