Chapter eight: Applejack.
Applejack was actually a part of a large farming family in her human life but when the explosion happened well her parents ended up dead because the mutation ended up being too much for them thus they couldn't mutate into ponies. She managed to have enough memory to remain with her actual family.
In truth she believes she never really had parents and Granny Smith raised her and her two siblings while the rest of their family went out to make settlements else where.
Granny Smith was a part of the group that made ponyville but the mutation made her human memories seem like pony memories along with being messed up thanks to the mutation.
Since Applebloom was a baby when the explosion happened she struggles to understand what she is good at thus coming off as stupid along with the other cutie mark crusaders who were also babies when the explosion happened.
All of the cutie mark crusaders actually knew who their sisters, well and brother for Applebloom, are but Scootaloo and Rainbow took a little longer to truly embrace their slightly different sister hood again….. Even though Scootaloo was actually an abandoned child of a street gang whore that was adopted by Rainbow dash to teach her things.
Applejack took over as leader at the farm as being a young child when the explosion happened she is more adapted to the new world than the rest at the farm.
The zap apples actually were there all along as regular apple trees that were mutated in the explosion.
Applejack is obsessed with apples because that's the main thing she grew up with and the only thing her human memory remembers most clearly from her past as a human.
Her mother always told her that honesty is the best policy and thus tries to stay honest but no one is perfect.