Sassaflash appeared in every single season of the show. But she wasn’t seen in the movie because that pony looking up at the Storm King’s airship had color schemes that reassembled Sassaflash. Despite the screenshot ended up being featured in the Sassaflash Gallery page in the official MLP wiki. Now that’s something I like to call, “the wow factor”. And because Sassaflash was or wasn’t seen in the film, I would agree that she was present attending the Friendship Festival in Canterlot, being enslaved, arrested, menaced, punished, siezed, and/or captured by the Storm King and his army, and later present when Equestria was full repaired and restored back to normal after the Storm King and his army either died or defeated and the Friendship Festival resumes.
What does that mean?!