The Sun will rise (edited more logical version)
When Naruto bring Sasuke back after VOTE he was thrown in to the cell where he meet his parents and sister and found out he had in himself only kyuubi soul when his sister have it chakra and they left naruto in konoha to train his sister in controling fox energy, but found out that bijuu chakra his sister have isn't regenerating unlike his so they chose to kill him to make kyuubi soul come to his sister and as his fight was a good pretext to kill him they chose to kill him publicly, but before naruto death Kurama take control of him and told Minato that he would prefer to die then help someone who would kill his own son and used some technique to fuse his and Naruto soul together and thanks to this technique they were reincarnated as Sunset shimmer. From this point everything is going like in MLP series (Kurama personality at this time is dominant) to the point where she jump into the window she is being teleported to uzu no kuni ruins and gained all her memories from her old life (as Naruto and Kurama) and chose to learn everything she can from this ruin and sometime later she learned earth ponies and pegasus magic (ep: plants growth faster p: cloud walking) with made her slowly transform into an alicorn but she didn't knowing that fealt only pain felling as if she would explode from to much magic so she decided to steal magic element from twilight hoping this will help.