Since it's my birthday, this is just something I've thrown together using a few 'Ugly Duckling's' for idea's

Basically one day Fluttershy finds a baby Pegasus and adopts her as her own.
And because of her little wings, that baby Pegasus gets laughed at by her class mates. But working with her friend Rainbow Dash, they work on getting their wings stronger and helped each other to fly.
Then one day, the baby Pegasus finds her real family...