While Pinkie is in Canterlot to help Cadence, Chrysalis comes and takes the others from their homes in Ponyville. Pinkie must go on a long journey with the Cutie Mark Crusaders to rescue them from the clutches of Queen Chrysalis. FlanChan helped me by editing it a bit.
The plot and timing doesn't really make much sense, and the characterisation is quite weak with far more telling than showing. I recommend you read back over and write more to fill in the inconsistencies.