After working every day with the Weather Patrol for Ponyville and Cloudsdale, Rainbow Dash discovers the Wonderbolts are holding a contest to see who is worthy of becoming a new Wonderbolt.
With her strike of luck, she doesn't just win the competition, but Soarins heart, but their relationship is kept hidden from others until it becomes public at the Grand Galloping Gala. If they thought Spitfires jealousy was bad, wait until all of Equestria gets involved.
(And one more thing. I know there are typos and I'm trying to spot them so don't make a prissy ass comment about something I'm already trying to fix. if you do don't bother to read it)