Yea, I know I said that the story would be cancelled. But I don't want you all to be entirely in the dark about what was going to happen, so I'm here to tell you!
Rainbow Shine would have traveled Equestria, From Baltimare to the Hayseed Swamps, to the badlands, Dodge City, Las Pegases, Vanhoover, Canerlot and Ponyville, respectively. While on the way meeting ponies and creatures of all kinds, on her quest to find out what she's meant for in this world. After having found her place in Ponyville and moved in, There would have been either an epilogue or a second part involving her parents more. It would have gone like this:
Rainbow Shine would have been cleaning her house one day in which she finds her old prism. (She'd be 22 by this point) And she'd sit there in remembrance for a while, and finally end up making the decision to go to Princess Celestia about it. (And yes, the original plan would have been to have Rainbow Shine become friends with Celestia.... after she attempted to rob her of some things from the Castle treasury.) She would've told Princess Celestia about it, and she'd have absolutely no idea what Rainbow Shine was talking about. But in her previous adventure whilst in the Unicorn Range (Check a map of Equestria, it's a real thing) she would continuously get food and water in the night, and there was still nopony around for miles. She was on her own (or so she thought). Shine then returns to the Unicorn Range to steak out for a few days before seeing a small group of ponies exiting a secret place hidden inside the mountain. She would have eventually gotten inside, only to find out that this place was for a secret Unicorn cult. A cult that planned on eventually taking over Equestria, etc. And it's right before she leaves to run off and tell the Princesses that she spots- a similar looking mane and tail. And coat. And cutie mark. She sees Rown again after all these years. Along with Scarlet, whop eventually end up sneaking out to see her the following night to catch up and tell her that they're (spoiler alert) her parents (OH MY GOD I totally didn't see that one coming) and that they were the ones continuously bringing her food and supplies (and they told her that the mountain itself was just the beginning of a tunnel system that runs through all of Equestria, aka, how they could go to and from the orphanage to the mountain so fast in Chapter two) that would've been for them. So after an internal conflict and talking to Rown and Scarlet a few more nights, she decides to go and tell Celestia about the situation and an all-out war breaks loose. Eventually Scarlet would've been injured and Rainbow Shine would've taken her back to her house in Ponyville. Then going back in to fight, Rainbow Shine would have also killed the Headmaster (mentioned in chapter two) and then his wife gets real angry. Then is when Celestia would finally get off her lazy ass and do something about it, and actually ends up turning them all into Changlings. (Yes, this is my head cannon on Changlings until we get more backstory!!!!) And unwilling to make any exception, Celestia also would turn Rown and Scarlet into Changlings after Rainbow Shine said her goodbyes, and banish the whole Colony to... wherever they're supposed to be O.o and the Headmaster's wife would be Queen Chrissy herself, obviously. Sad ending, but happy she knows who she is, and that they were still there for her and risked their life in doing so. SO that's what was supposed to happen, I'm really sorry it didn't, y'all..... But, do expect a short story here soon :)