what movie makes everyone think twilight sparkle died

A new dark force threatens Ponyville, and the Mane 6 – Twilight Sparkle, Applejack, Rainbow Dash, Pinkie Pie, Fluttershy and Rarity – embark on an unforgettable journey beyond Equestria where they meet new friends and exciting challenges on a quest to use the magic of friendship and save their home.

The first day of Spring is on its way and the Little Ponies are preparing for it with a big festival. But all the fun may come to an end if the witch Hydia has her way! Can the Ponies defeat Hydia and her evil daughters, Reeka and Draggle? More importantly, can they save Ponyland from the witches’ concoction, the strange purple goo called Smooze, that’s threatening to bury the whole town?