Applejack.

Two months later, Rainbow Dash was found by the police and hung in the town square for every pony to see. Pinkie ran off, and was never seen again. Most likely it was that she committed suicide. Rarity wouldn't eat for long periods of time, and eventually stopped entirely. She only lasted about a week. Fluttershy started working as a full time prostitute and died of an infection she contracted from a customer. Applejack was the last one still alive. She was good at handling things like this, even though she was sad, she never did anything extreme. She married and had two happy children after she moved away from Ponyville and to Appleloosa. She died at old age of natural causes. And when she got a glimpse of her next life, she was horrified.

She was going to be Twilight Sparkle, and have to relive how she died--- but this time as the person dying. Once she was transferred to her new life she wouldn't be able to remember anything before that, and couldn't stop the disaster of the prank gone wrong. Her life was going to be a living hell, and there was nothing she could do to stop it.