Twilight and Spike are sucked into the portal and dropped into another time.
This time is actually more peaceful than the others. Everything is relatively fine.
They find one of their friends and tell them what they've been through.
In this time, Chrysalis invaded but she was killed in battle but Celestia was also gravely wounded and Luna didn't fair that much better when the release of Discord brought about Nightmare Moon and she killed Discord and in turn killed Luna.
This worlds version of Twilight took responsibility to Equestria and ascended further to pure alicorn status, what Celestia and Luna were.
Twilight can't believe it. She mass teleports all the way to Canterlot. There's a huge pile of flowers surrounding the Celestia statue in Canterlot square.
She goes to Luna, needing to hear it from the horses mouth. Luna, scarred physically and emotionally from the battle, confirms her worst fear. She finally collapses and shakes in tears.
No, she goes to the throne room and Alternate Her is acting as co-ruler. Equestria was weakened with Celestia's death but have allies in the Crystal Empire and Yaks.
Alternate Twilight tells her things are peaceful but it was hard to heal.